Search | arXiv e-print repository

<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"/> <meta name="viewport" content="width=device-width, initial-scale=1"/>  <link rel="apple-touch-icon" sizes="180x180" href="https://static.arxiv.org/static/base/1.0.0a5/images/icons/apple-touch-icon.png"> <link rel="icon" type="image/png" sizes="32x32" href="https://static.arxiv.org/static/base/1.0.0a5/images/icons/favicon-32x32.png"> <link rel="icon" type="image/png" sizes="16x16" href="https://static.arxiv.org/static/base/1.0.0a5/images/icons/favicon-16x16.png"> <link rel="manifest" href="https://static.arxiv.org/static/base/1.0.0a5/images/icons/site.webmanifest"> <link rel="mask-icon" href="https://static.arxiv.org/static/base/1.0.0a5/images/icons/safari-pinned-tab.svg" color="#b31b1b"> <link rel="shortcut icon" href="https://static.arxiv.org/static/base/1.0.0a5/images/icons/favicon.ico"> <meta name="msapplication-TileColor" content="#b31b1b"> <meta name="msapplication-config" content="images/icons/browserconfig.xml"> <meta name="theme-color" content="#b31b1b">  <title>Search | arXiv e-print repository</title> <script defer src="https://static.arxiv.org/static/base/1.0.0a5/fontawesome-free-5.11.2-web/js/all.js"></script> <link rel="stylesheet" href="https://static.arxiv.org/static/base/1.0.0a5/css/arxivstyle.css" /> <script type="text/x-mathjax-config"> MathJax.Hub.Config({ messageStyle: "none", extensions: ["tex2jax.js"], jax: ["input/TeX", "output/HTML-CSS"], tex2jax: { inlineMath: [ ['$','$'], ["\$","\$"] ], displayMath: [ ['$$','$$'], ["\\[","\\]"] ], processEscapes: true, ignoreClass: '.*', processClass: 'mathjax.*' }, TeX: { extensions: ["AMSmath.js", "AMSsymbols.js", "noErrors.js"], noErrors: { inlineDelimiters: ["$","$"], multiLine: false, style: { "font-size": "normal", "border": "" } } }, "HTML-CSS": { availableFonts: ["TeX"] } }); </script> <script src='//static.arxiv.org/MathJax-2.7.3/MathJax.js'></script> <script src="https://static.arxiv.org/static/base/1.0.0a5/js/notification.js"></script> <link rel="stylesheet" href="https://static.arxiv.org/static/search/0.5.6/css/bulma-tooltip.min.css" /> <link rel="stylesheet" href="https://static.arxiv.org/static/search/0.5.6/css/search.css" /> <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha256-k2WSCIexGzOj3Euiig+TlR8gA0EmPjuc79OEeY5L45g=" crossorigin="anonymous"></script> <script src="https://static.arxiv.org/static/search/0.5.6/js/fieldset.js"></script> <style> radio#cf-customfield_11400 { display: none; } </style> </head> <body> <header><a href="#main-container" class="is-sr-only">Skip to main content</a>  <div class="attribution level is-marginless" role="banner"> <div class="level-left"> <a class="level-item" href="https://cornell.edu/"><img src="https://static.arxiv.org/static/base/1.0.0a5/images/cornell-reduced-white-SMALL.svg" alt="Cornell University" width="200" aria-label="logo" /></a> </div> <div class="level-right is-marginless"><p class="sponsors level-item is-marginless"><span id="support-ack-url">We gratefully acknowledge support from<br /> the Simons Foundation, <a href="https://info.arxiv.org/about/ourmembers.html">member institutions</a>, and all contributors. <a href="https://info.arxiv.org/about/donate.html">Donate</a></span></p></div> </div>  <div class="identity level is-marginless"> <div class="level-left"> <div class="level-item"> <a class="arxiv" href="https://arxiv.org/" aria-label="arxiv-logo"> <img src="https://static.arxiv.org/static/base/1.0.0a5/images/arxiv-logo-one-color-white.svg" aria-label="logo" alt="arxiv logo" width="85" style="width:85px;"/> </a> </div> </div> <div class="search-block level-right"> <form class="level-item mini-search" method="GET" action="https://arxiv.org/search"> <div class="field has-addons"> <div class="control"> <input class="input is-small" type="text" name="query" placeholder="Search..." aria-label="Search term or terms" /> <p class="help"><a href="https://info.arxiv.org/help">Help</a> | <a href="https://arxiv.org/search/advanced">Advanced Search</a></p> </div> <div class="control"> <div class="select is-small"> <select name="searchtype" aria-label="Field to search"> <option value="all" selected="selected">All fields</option> <option value="title">Title</option> <option value="author">Author</option> <option value="abstract">Abstract</option> <option value="comments">Comments</option> <option value="journal_ref">Journal reference</option> <option value="acm_class">ACM classification</option> <option value="msc_class">MSC classification</option> <option value="report_num">Report number</option> <option value="paper_id">arXiv identifier</option> <option value="doi">DOI</option> <option value="orcid">ORCID</option> <option value="author_id">arXiv author ID</option> <option value="help">Help pages</option> <option value="full_text">Full text</option> </select> </div> </div> <input type="hidden" name="source" value="header"> <button class="button is-small is-cul-darker">Search</button> </div> </form> </div> </div>  <div class="container"> <div class="user-tools is-size-7 has-text-right has-text-weight-bold" role="navigation" aria-label="User menu"> <a href="https://arxiv.org/login">Login</a> </div> </div> </header> <main class="container" id="main-container"> <div class="level is-marginless"> <div class="level-left"> <h1 class="title is-clearfix"> Showing 1–50 of 82 results for author: <span class="mathjax">Schoop, L M</span> </h1> </div> <div class="level-right is-hidden-mobile">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> <div class="content"> <form method="GET" action="/search/cond-mat" aria-role="search"> Searching in archive <strong>cond-mat</strong>. <a href="/search/?searchtype=author&query=Schoop%2C+L+M">Search in all archives.</a> <div class="field has-addons-tablet"> <div class="control is-expanded"> <label for="query" class="hidden-label">Search term or terms</label> <input class="input is-medium" id="query" name="query" placeholder="Search term..." type="text" value="Schoop, L M"> </div> <div class="select control is-medium"> <label class="is-hidden" for="searchtype">Field</label> <select class="is-medium" id="searchtype" name="searchtype"><option value="all">All fields</option><option value="title">Title</option><option selected value="author">Author(s)</option><option value="abstract">Abstract</option><option value="comments">Comments</option><option value="journal_ref">Journal reference</option><option value="acm_class">ACM classification</option><option value="msc_class">MSC classification</option><option value="report_num">Report number</option><option value="paper_id">arXiv identifier</option><option value="doi">DOI</option><option value="orcid">ORCID</option><option value="license">License (URI)</option><option value="author_id">arXiv author ID</option><option value="help">Help pages</option><option value="full_text">Full text</option></select> </div> <div class="control"> <button class="button is-link is-medium">Search</button> </div> </div> <div class="field"> <div class="control is-size-7"> <label class="radio"> <input checked id="abstracts-0" name="abstracts" type="radio" value="show"> Show abstracts </label> <label class="radio"> <input id="abstracts-1" name="abstracts" type="radio" value="hide"> Hide abstracts </label> </div> </div> <div class="is-clearfix" style="height: 2.5em"> <div class="is-pulled-right"> <a href="/search/advanced?terms-0-term=Schoop%2C+L+M&terms-0-field=author&size=50&order=-announced_date_first">Advanced Search</a> </div> </div> <input type="hidden" name="order" value="-announced_date_first"> <input type="hidden" name="size" value="50"> </form> <div class="level breathe-horizontal"> <div class="level-left"> <form method="GET" action="/search/"> <div style="display: none;"> <select id="searchtype" name="searchtype"><option value="all">All fields</option><option value="title">Title</option><option selected value="author">Author(s)</option><option value="abstract">Abstract</option><option value="comments">Comments</option><option value="journal_ref">Journal reference</option><option value="acm_class">ACM classification</option><option value="msc_class">MSC classification</option><option value="report_num">Report number</option><option value="paper_id">arXiv identifier</option><option value="doi">DOI</option><option value="orcid">ORCID</option><option value="license">License (URI)</option><option value="author_id">arXiv author ID</option><option value="help">Help pages</option><option value="full_text">Full text</option></select> <input id="query" name="query" type="text" value="Schoop, L M"> <ul id="abstracts"><li><input checked id="abstracts-0" name="abstracts" type="radio" value="show"> <label for="abstracts-0">Show abstracts</label></li><li><input id="abstracts-1" name="abstracts" type="radio" value="hide"> <label for="abstracts-1">Hide abstracts</label></li></ul> </div> <div class="box field is-grouped is-grouped-multiline level-item"> <div class="control"> <span class="select is-small"> <select id="size" name="size"><option value="25">25</option><option selected value="50">50</option><option value="100">100</option><option value="200">200</option></select> </span> <label for="size">results per page</label>. </div> <div class="control"> <label for="order">Sort results by</label> <span class="select is-small"> <select id="order" name="order"><option selected value="-announced_date_first">Announcement date (newest first)</option><option value="announced_date_first">Announcement date (oldest first)</option><option value="-submitted_date">Submission date (newest first)</option><option value="submitted_date">Submission date (oldest first)</option><option value="">Relevance</option></select> </span> </div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a href="/search/?searchtype=author&query=Schoop%2C+L+M&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Schoop%2C+L+M&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=Schoop%2C+L+M&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> </ul> </nav> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2411.09741">arXiv:2411.09741</a> <span> [<a href="https://arxiv.org/pdf/2411.09741">pdf</a>, <a href="https://arxiv.org/format/2411.09741">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> </div> <p class="title is-5 mathjax"> 2D Theoretically Twistable Material Database </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Jiang%2C+Y">Yi Jiang</a>, <a href="/search/cond-mat?searchtype=author&query=Petralanda%2C+U">Urko Petralanda</a>, <a href="/search/cond-mat?searchtype=author&query=Skorupskii%2C+G">Grigorii Skorupskii</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+Q">Qiaoling Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Pi%2C+H">Hanqi Pi</a>, <a href="/search/cond-mat?searchtype=author&query=C%C4%83lug%C4%83ru%2C+D">Dumitru C膬lug膬ru</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+H">Haoyu Hu</a>, <a href="/search/cond-mat?searchtype=author&query=Xie%2C+J">Jiaze Xie</a>, <a href="/search/cond-mat?searchtype=author&query=Mustaf%2C+R+A">Rose Albu Mustaf</a>, <a href="/search/cond-mat?searchtype=author&query=H%C3%B6hn%2C+P">Peter H枚hn</a>, <a href="/search/cond-mat?searchtype=author&query=Haase%2C+V">Vicky Haase</a>, <a href="/search/cond-mat?searchtype=author&query=Vergniory%2C+M+G">Maia G. Vergniory</a>, <a href="/search/cond-mat?searchtype=author&query=Claassen%2C+M">Martin Claassen</a>, <a href="/search/cond-mat?searchtype=author&query=Elcoro%2C+L">Luis Elcoro</a>, <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+N">Nicolas Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Shan%2C+J">Jie Shan</a>, <a href="/search/cond-mat?searchtype=author&query=Mak%2C+K+F">Kin Fai Mak</a>, <a href="/search/cond-mat?searchtype=author&query=Efetov%2C+D+K">Dmitri K. Efetov</a>, <a href="/search/cond-mat?searchtype=author&query=Morosan%2C+E">Emilia Morosan</a>, <a href="/search/cond-mat?searchtype=author&query=Kennes%2C+D+M">Dante M. Kennes</a>, <a href="/search/cond-mat?searchtype=author&query=Rubio%2C+A">Angel Rubio</a>, <a href="/search/cond-mat?searchtype=author&query=Xian%2C+L">Lede Xian</a>, <a href="/search/cond-mat?searchtype=author&query=Felser%2C+C">Claudia Felser</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Bernevig%2C+B+A">B. Andrei Bernevig</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2411.09741v1-abstract-short" style="display: inline;"> The study of twisted two-dimensional (2D) materials, where twisting layers create moir茅 superlattices, has opened new opportunities for investigating topological phases and strongly correlated physics. While systems such as twisted bilayer graphene (TBG) and twisted transition metal dichalcogenides (TMDs) have been extensively studied, the broader potential of a seemingly infinite set of other twi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.09741v1-abstract-full').style.display = 'inline'; document.getElementById('2411.09741v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.09741v1-abstract-full" style="display: none;"> The study of twisted two-dimensional (2D) materials, where twisting layers create moir茅 superlattices, has opened new opportunities for investigating topological phases and strongly correlated physics. While systems such as twisted bilayer graphene (TBG) and twisted transition metal dichalcogenides (TMDs) have been extensively studied, the broader potential of a seemingly infinite set of other twistable 2D materials remains largely unexplored. In this paper, we define "theoretically twistable materials" as single- or multi-layer structures that allow for the construction of simple continuum models of their moir茅 structures. This excludes, for example, materials with a "spaghetti" of bands or those with numerous crossing points at the Fermi level, for which theoretical moir茅 modeling is unfeasible. We present a high-throughput algorithm that systematically searches for theoretically twistable semimetals and insulators based on the Topological 2D Materials Database. By analyzing key electronic properties, we identify thousands of new candidate materials that could host rich topological and strongly correlated phenomena when twisted. We propose representative twistable materials for realizing different types of moir茅 systems, including materials with different Bravais lattices, valleys, and strength of spin-orbital coupling. We provide examples of crystal growth for several of these materials and showcase twisted bilayer band structures along with simplified twisted continuum models. Our results significantly broaden the scope of moir茅 heterostructures and provide a valuable resource for future experimental and theoretical studies on novel moir茅 systems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.09741v1-abstract-full').style.display = 'none'; document.getElementById('2411.09741v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">15+81 pages, 5+187 figures, 4+104 tables. The Topological 2D Materials Database is available at https://topologicalquantumchemistry.com/topo2d/index.html . See also the accompanying paper "Two-dimensional Topological Quantum Chemistry and Catalog of Topological Materials"</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2411.09496">arXiv:2411.09496</a> <span> [<a href="https://arxiv.org/pdf/2411.09496">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41586-024-08091-8">10.1038/s41586-024-08091-8 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Charge-Neutral Electronic Excitations in Quantum Insulators </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wu%2C+S">Sanfeng Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Sodemann%2C+I">Inti Sodemann</a>, <a href="/search/cond-mat?searchtype=author&query=Moessner%2C+R">Roderich Moessner</a>, <a href="/search/cond-mat?searchtype=author&query=Cava%2C+R+J">Robert J. Cava</a>, <a href="/search/cond-mat?searchtype=author&query=Ong%2C+N+P">N. P. Ong</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2411.09496v1-abstract-short" style="display: inline;"> Experiments on quantum materials have uncovered many interesting quantum phases ranging from superconductivity to a variety of topological quantum matter including the recently observed fractional quantum anomalous Hall insulators. The findings have come in parallel with the development of approaches to probe the rich excitations inherent in such systems. In contrast to observing electrically char… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.09496v1-abstract-full').style.display = 'inline'; document.getElementById('2411.09496v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.09496v1-abstract-full" style="display: none;"> Experiments on quantum materials have uncovered many interesting quantum phases ranging from superconductivity to a variety of topological quantum matter including the recently observed fractional quantum anomalous Hall insulators. The findings have come in parallel with the development of approaches to probe the rich excitations inherent in such systems. In contrast to observing electrically charged excitations, the detection of charge-neutral electronic excitations in condensed matter remains difficult, though they are essential to understanding a large class of strongly correlated phases. Low-energy neutral excitations are especially important in characterizing unconventional phases featuring electron fractionalization, such as quantum spin liquids, spin ices, and insulators with neutral Fermi surfaces. In this perspective, we discuss searches for neutral fermionic, bosonic, or anyonic excitations in unconventional insulators, highlighting theoretical and experimental progress in probing excitonic insulators, new quantum spin liquid candidates and emergent correlated insulators based on two-dimensional layered crystals and moir茅 materials. We outline the promises and challenges in probing and utilizing quantum insulators, and discuss exciting new opportunities for future advancements offered by ideas rooted in next-generation quantum materials, devices, and experimental schemes. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.09496v1-abstract-full').style.display = 'none'; document.getElementById('2411.09496v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">23 pages, 4 figures; A Perspective/Review Article published in Nature</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature (2024) 635 301-310 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2411.08322">arXiv:2411.08322</a> <span> [<a href="https://arxiv.org/pdf/2411.08322">pdf</a>, <a href="https://arxiv.org/format/2411.08322">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> </div> <p class="title is-5 mathjax"> Uncovering the Hidden Ferroaxial Density Wave as the Origin of the Axial Higgs Mode in RTe$_3$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Singh%2C+B">Birender Singh</a>, <a href="/search/cond-mat?searchtype=author&query=McNamara%2C+G">Grant McNamara</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+K">Kyung-Mo Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Siddique%2C+S">Saif Siddique</a>, <a href="/search/cond-mat?searchtype=author&query=Funni%2C+S+D">Stephen D. Funni</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+W">Weizhe Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Luo%2C+X">Xiangpeng Luo</a>, <a href="/search/cond-mat?searchtype=author&query=Sakrikar%2C+P">Piyush Sakrikar</a>, <a href="/search/cond-mat?searchtype=author&query=Kenney%2C+E+M">Eric M. Kenney</a>, <a href="/search/cond-mat?searchtype=author&query=Singha%2C+R">Ratnadwip Singha</a>, <a href="/search/cond-mat?searchtype=author&query=Alekseev%2C+S">Sergey Alekseev</a>, <a href="/search/cond-mat?searchtype=author&query=Ghorashi%2C+S+A+A">Sayed Ali Akbar Ghorashi</a>, <a href="/search/cond-mat?searchtype=author&query=Hicken%2C+T+J">Thomas J. Hicken</a>, <a href="/search/cond-mat?searchtype=author&query=Baines%2C+C">Christopher Baines</a>, <a href="/search/cond-mat?searchtype=author&query=Luetkens%2C+H">Hubertus Luetkens</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Y">Yiping Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Plisson%2C+V+M">Vincent M. Plisson</a>, <a href="/search/cond-mat?searchtype=author&query=Geiwitz%2C+M">Michael Geiwitz</a>, <a href="/search/cond-mat?searchtype=author&query=Occhialini%2C+C+A">Connor A. Occhialini</a>, <a href="/search/cond-mat?searchtype=author&query=Comin%2C+R">Riccardo Comin</a>, <a href="/search/cond-mat?searchtype=author&query=Graf%2C+M+J">Michael J. Graf</a>, <a href="/search/cond-mat?searchtype=author&query=Zhao%2C+L">Liuyan Zhao</a>, <a href="/search/cond-mat?searchtype=author&query=Cano%2C+J">Jennifer Cano</a>, <a href="/search/cond-mat?searchtype=author&query=Fernandes%2C+R+M">Rafael M. Fernandes</a>, <a href="/search/cond-mat?searchtype=author&query=Cha%2C+J+J">Judy J. Cha</a> , et al. (2 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2411.08322v2-abstract-short" style="display: inline;"> The recent discovery of an axial amplitude (Higgs) mode in the long-studied charge density wave (CDW) systems GdTe$_3$ and LaTe$_3$ suggests a heretofore unidentified hidden order. A theoretical study proposed that the axial Higgs results from a hidden ferroaxial component of the CDW, which could arise from non-trivial orbital texture. Here, we report extensive experimental studies on ErTe$_3$ and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.08322v2-abstract-full').style.display = 'inline'; document.getElementById('2411.08322v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.08322v2-abstract-full" style="display: none;"> The recent discovery of an axial amplitude (Higgs) mode in the long-studied charge density wave (CDW) systems GdTe$_3$ and LaTe$_3$ suggests a heretofore unidentified hidden order. A theoretical study proposed that the axial Higgs results from a hidden ferroaxial component of the CDW, which could arise from non-trivial orbital texture. Here, we report extensive experimental studies on ErTe$_3$ and HoTe$_3$ that possess a high-temperature CDW similar to other RTe$_3$ (R = rare earth), along with an additional low-temperature CDW with an orthogonal ordering vector. Combining Raman spectroscopy with large-angle convergent beam electron diffraction (LACBED), rotational anisotropy second-harmonic generation (RA-SHG), and muon-spin relaxation ($渭$SR), we provide unambiguous evidence that the high-temperature CDW breaks translation, rotation, and all vertical and diagonal mirror symmetries, but not time-reversal or inversion. In contrast, the low-temperature CDW only additionally breaks translation symmetry. Simultaneously, Raman scattering shows the high-temperature CDW produces an axial Higgs mode while the low-temperature mode is scalar. The weak monoclinic structural distortion and clear axial response in Raman and SHG are consistent with a ferroaxial phase in RTe$_3$ driven by coupled orbital and charge orders. Thus, our study provides a new standard for uncovering unconventional orders and confirms the power of Higgs modes to reveal them. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.08322v2-abstract-full').style.display = 'none'; document.getElementById('2411.08322v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">28 pages, 5 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2409.19783">arXiv:2409.19783</a> <span> [<a href="https://arxiv.org/pdf/2409.19783">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> </div> <p class="title is-5 mathjax"> Emergence of reentrant structural modulations far beyond the thermal limit </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Mathur%2C+N">Nitish Mathur</a>, <a href="/search/cond-mat?searchtype=author&query=Cheng%2C+G">Guangming Cheng</a>, <a href="/search/cond-mat?searchtype=author&query=Ballester%2C+F">Francesc Ballester</a>, <a href="/search/cond-mat?searchtype=author&query=Carrel%2C+G">Gabrielle Carrel</a>, <a href="/search/cond-mat?searchtype=author&query=Plisson%2C+V+M">Vincent M. Plisson</a>, <a href="/search/cond-mat?searchtype=author&query=Yuan%2C+F">Fang Yuan</a>, <a href="/search/cond-mat?searchtype=author&query=Zheng%2C+J">Jiangchang Zheng</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+C">Caiyun Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+S+B">Scott B. Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Singha%2C+R">Ratnadwip Singha</a>, <a href="/search/cond-mat?searchtype=author&query=Chatterjee%2C+S">Sudipta Chatterjee</a>, <a href="/search/cond-mat?searchtype=author&query=Burch%2C+K+S">Kenneth S. Burch</a>, <a href="/search/cond-mat?searchtype=author&query=J%C3%A4ck%2C+B">Berthold J盲ck</a>, <a href="/search/cond-mat?searchtype=author&query=Errea%2C+I">Ion Errea</a>, <a href="/search/cond-mat?searchtype=author&query=Vergniory%2C+M+G">Maia G. Vergniory</a>, <a href="/search/cond-mat?searchtype=author&query=Yao%2C+N">Nan Yao</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2409.19783v1-abstract-short" style="display: inline;"> A single material can exist in different states, with solids, liquids, and gases being the most familiar examples. In materials, these states can exhibit periodic structures spanning from atomic to macroscopic length scales. The conventional wisdom is that a low-symmetry periodic structure transitions into a high-symmetry structure as temperature increases beyond the critical point, which is defin… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.19783v1-abstract-full').style.display = 'inline'; document.getElementById('2409.19783v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.19783v1-abstract-full" style="display: none;"> A single material can exist in different states, with solids, liquids, and gases being the most familiar examples. In materials, these states can exhibit periodic structures spanning from atomic to macroscopic length scales. The conventional wisdom is that a low-symmetry periodic structure transitions into a high-symmetry structure as temperature increases beyond the critical point, which is defined by a thermal limit. In this work, we demonstrate an unforeseen emergence of low-symmetry modulated structures with a reentrant phase in nanoflakes of two-dimensional TaCo2Te2 far beyond their thermal limit, using in-situ heating transmission electron microscopy. We contend that entropy can drive the reappearance of structural modulations, consistent with predicted dynamic structural instabilities in undistorted TaCo2Te2, and further supported by Raman measurements. These findings not only reveal unexpected phase transitions in a crystalline material but also present a new pathway for creating novel ordered phases in low-dimensional systems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.19783v1-abstract-full').style.display = 'none'; document.getElementById('2409.19783v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">36 pages, 19 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2409.04594">arXiv:2409.04594</a> <span> [<a href="https://arxiv.org/pdf/2409.04594">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> </div> <p class="title is-5 mathjax"> Anomalous Superconductivity in Twisted MoTe2 Nanojunctions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Jia%2C+Y">Yanyu Jia</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+T">Tiancheng Song</a>, <a href="/search/cond-mat?searchtype=author&query=Zheng%2C+Z+J">Zhaoyi Joy Zheng</a>, <a href="/search/cond-mat?searchtype=author&query=Cheng%2C+G">Guangming Cheng</a>, <a href="/search/cond-mat?searchtype=author&query=Uzan%2C+A+J">Ayelet J Uzan</a>, <a href="/search/cond-mat?searchtype=author&query=Yu%2C+G">Guo Yu</a>, <a href="/search/cond-mat?searchtype=author&query=Tang%2C+Y">Yue Tang</a>, <a href="/search/cond-mat?searchtype=author&query=Pollak%2C+C+J">Connor J. Pollak</a>, <a href="/search/cond-mat?searchtype=author&query=Yuan%2C+F">Fang Yuan</a>, <a href="/search/cond-mat?searchtype=author&query=Onyszczak%2C+M">Michael Onyszczak</a>, <a href="/search/cond-mat?searchtype=author&query=Watanabe%2C+K">Kenji Watanabe</a>, <a href="/search/cond-mat?searchtype=author&query=Taniguchi%2C+T">Takashi Taniguchi</a>, <a href="/search/cond-mat?searchtype=author&query=Lei%2C+S">Shiming Lei</a>, <a href="/search/cond-mat?searchtype=author&query=Yao%2C+N">Nan Yao</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Ong%2C+N+P">N. P. Ong</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+S">Sanfeng Wu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2409.04594v1-abstract-short" style="display: inline;"> Introducing superconductivity in topological materials can lead to innovative electronic phases and device functionalities. Here, we present a new strategy for quantum engineering of superconducting junctions in moire materials through direct, on-chip, and fully encapsulated 2D crystal growth. We achieve robust and designable superconductivity in Pd-metalized twisted bilayer molybdenum ditelluride… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.04594v1-abstract-full').style.display = 'inline'; document.getElementById('2409.04594v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.04594v1-abstract-full" style="display: none;"> Introducing superconductivity in topological materials can lead to innovative electronic phases and device functionalities. Here, we present a new strategy for quantum engineering of superconducting junctions in moire materials through direct, on-chip, and fully encapsulated 2D crystal growth. We achieve robust and designable superconductivity in Pd-metalized twisted bilayer molybdenum ditelluride (MoTe2) and observe anomalous superconducting effects in high-quality junctions across ~ 20 moire cells. Surprisingly, the junction develops enhanced, instead of weakened, superconducting behaviors, exhibiting fluctuations to a higher critical magnetic field compared to its adjacent Pd7MoTe2 superconductor. Additionally, the critical current further exhibits a striking V-shaped minimum at zero magnetic field. These features are unexpected in conventional Josephson junctions and indeed absent in junctions of natural bilayer MoTe2 created using the same approach. We discuss implications of these observations, including the possible formation of mixed even- and odd-parity superconductivity at the moire junctions. Our results also demonstrate a pathway to engineer and investigate superconductivity in fractional Chern insulators. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.04594v1-abstract-full').style.display = 'none'; document.getElementById('2409.04594v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">25 pages, 5 main article figures and 10 supplementary figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2409.00455">arXiv:2409.00455</a> <span> [<a href="https://arxiv.org/pdf/2409.00455">pdf</a>, <a href="https://arxiv.org/format/2409.00455">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> </div> <p class="title is-5 mathjax"> Bonding Interactions Can Drive Topological Phase Transitions in a Zintl Antiferromagnetic Insulator </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Berry%2C+T">Tanya Berry</a>, <a href="/search/cond-mat?searchtype=author&query=Moya%2C+J+M">Jaime M. Moya</a>, <a href="/search/cond-mat?searchtype=author&query=Smiadak%2C+D">David Smiadak</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+S+B">Scott B. Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Aharon%2C+S">Sigalit Aharon</a>, <a href="/search/cond-mat?searchtype=author&query=Zevalkink%2C+A">Alexandra Zevalkink</a>, <a href="/search/cond-mat?searchtype=author&query=McQueen%2C+T+M">Tyrel M. McQueen</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2409.00455v1-abstract-short" style="display: inline;"> While $\sim$30% of materials are reported to be topological, topological insulators are rare. Magnetic topological insulators (MTI) are even harder to find. Identifying crystallographic features that can host the coexistence of a topological insulating phase with magnetic order is vital for finding intrinsic MTI materials. Thus far, most materials that are investigated for the determination of an… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.00455v1-abstract-full').style.display = 'inline'; document.getElementById('2409.00455v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.00455v1-abstract-full" style="display: none;"> While $\sim$30% of materials are reported to be topological, topological insulators are rare. Magnetic topological insulators (MTI) are even harder to find. Identifying crystallographic features that can host the coexistence of a topological insulating phase with magnetic order is vital for finding intrinsic MTI materials. Thus far, most materials that are investigated for the determination of an MTI are some combination of known topological insulators with a magnetic ion such as MnBi$_2$Te$_4$. Motivated by the recent success of EuIn$_{2}$As$_{2}$, we investigate the role of chemical pressure on topologically trivial insulator, Eu$_5$In$_2$Sb$_6$ via Ga substitution. Eu$_5$Ga$_2$Sb$_6$ is predicted to be topological but is synthetically difficult to stabilize. We look into the intermediate compositions between Eu$_5$In$_2$Sb$_6$ and Eu$_5$Ga$_2$Sb$_6$ through theoretical works to explore a topological phase transition and band inversion mechanism. We attribute the band inversion mechanism to changes in Eu-Sb hybridization as Ga is substituted for In due to chemical pressure. We also synthesize Eu$_{5}$In$_{4/3}$Ga$_{2/3}$Sb$_{6}$, the highest Ga concentration in Eu$_{5}$In$_{2-x}$Ga$_{x}$Sb$_{6}$, and report the thermodynamic, magnetic, transport, and Hall properties. Overall, our work paints a picture of a possible MTI via band engineering and explains why Eu-based Zintl compounds are suitable for the co-existence of magnetism and topology. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.00455v1-abstract-full').style.display = 'none'; document.getElementById('2409.00455v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 31 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2405.13601">arXiv:2405.13601</a> <span> [<a href="https://arxiv.org/pdf/2405.13601">pdf</a>, <a href="https://arxiv.org/format/2405.13601">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Uniaxial strain effects on the Fermi surface and quantum mobility of the Dirac nodal-line semimetal ZrSiS </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lorenz%2C+J+P">J. P. Lorenz</a>, <a href="/search/cond-mat?searchtype=author&query=Linnartz%2C+J+F">J. F. Linnartz</a>, <a href="/search/cond-mat?searchtype=author&query=Kool%2C+A">A. Kool</a>, <a href="/search/cond-mat?searchtype=author&query=van+Delft%2C+M+R">M. R. van Delft</a>, <a href="/search/cond-mat?searchtype=author&query=Guo%2C+W">W. Guo</a>, <a href="/search/cond-mat?searchtype=author&query=Aguilera%2C+I">I. Aguilera</a>, <a href="/search/cond-mat?searchtype=author&query=Singha%2C+R">R. Singha</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">L. M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Hussey%2C+N+E">N. E. Hussey</a>, <a href="/search/cond-mat?searchtype=author&query=Wiedmann%2C+S">S. Wiedmann</a>, <a href="/search/cond-mat?searchtype=author&query=de+Visser%2C+A">A. de Visser</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2405.13601v1-abstract-short" style="display: inline;"> ZrSiS has been identified as an exemplary Dirac nodal-line semimetal, in which the Dirac band crossings extend along a closed loop in momentum space. Recently, the topology of the Fermi surface of ZrSiS was uncovered in great detail by quantum oscillation studies. For a magnetic field along the tetragonal $c$ axis, a rich frequency spectrum was observed stemming from the principal electron and hol… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.13601v1-abstract-full').style.display = 'inline'; document.getElementById('2405.13601v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2405.13601v1-abstract-full" style="display: none;"> ZrSiS has been identified as an exemplary Dirac nodal-line semimetal, in which the Dirac band crossings extend along a closed loop in momentum space. Recently, the topology of the Fermi surface of ZrSiS was uncovered in great detail by quantum oscillation studies. For a magnetic field along the tetragonal $c$ axis, a rich frequency spectrum was observed stemming from the principal electron and hole pockets, and multiple magnetic breakdown orbits. In this work we use uniaxial strain as a tuning parameter for the Fermi surface and the low energy excitations. We measure the magnetoresistance of a single crystal under tensile (up to 0.34 %) and compressive (up to -0.28 %) strain exerted along the $a$ axis and in magnetic fields up to 30 T. We observe a systematic weakening of the peak structure in the Shubnikov-de Haas frequency spectrum upon changing from compressive to tensile strain. This effect may be explained by a decrease in the effective quantum mobility upon decreasing the $c/a$ ratio, which is corroborated by a concurrent increase in the Dingle temperature. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.13601v1-abstract-full').style.display = 'none'; document.getElementById('2405.13601v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">18 pages, 11 figures, to be published in Physical Review B</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2405.09665">arXiv:2405.09665</a> <span> [<a href="https://arxiv.org/pdf/2405.09665">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> </div> <p class="title is-5 mathjax"> Sign-Alternating Thermoelectric Quantum Oscillations and Insulating Landau Levels in Monolayer WTe2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Tang%2C+Y">Yue Tang</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+T">Tiancheng Song</a>, <a href="/search/cond-mat?searchtype=author&query=Guan%2C+H">Haosen Guan</a>, <a href="/search/cond-mat?searchtype=author&query=Jia%2C+Y">Yanyu Jia</a>, <a href="/search/cond-mat?searchtype=author&query=Yu%2C+G">Guo Yu</a>, <a href="/search/cond-mat?searchtype=author&query=Zheng%2C+Z+J">Zhaoyi Joy Zheng</a>, <a href="/search/cond-mat?searchtype=author&query=Uzan%2C+A+J">Ayelet J. Uzan</a>, <a href="/search/cond-mat?searchtype=author&query=Onyszczak%2C+M">Michael Onyszczak</a>, <a href="/search/cond-mat?searchtype=author&query=Singha%2C+R">Ratnadwip Singha</a>, <a href="/search/cond-mat?searchtype=author&query=Gui%2C+X">Xin Gui</a>, <a href="/search/cond-mat?searchtype=author&query=Watanabe%2C+K">Kenji Watanabe</a>, <a href="/search/cond-mat?searchtype=author&query=Taniguchi%2C+T">Takashi Taniguchi</a>, <a href="/search/cond-mat?searchtype=author&query=Cava%2C+R+J">Robert J. Cava</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Ong%2C+N+P">N. P. Ong</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+S">Sanfeng Wu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2405.09665v1-abstract-short" style="display: inline;"> The detection of Landau-level-like energy structures near the chemical potential of an insulator is essential to the search for a class of correlated electronic matter hosting charge-neutral fermions and Fermi surfaces, a long-proposed concept that remains elusive experimentally. Here we introduce and demonstrate that the magneto-thermoelectric response of a quantum insulator can reveal critical i… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.09665v1-abstract-full').style.display = 'inline'; document.getElementById('2405.09665v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2405.09665v1-abstract-full" style="display: none;"> The detection of Landau-level-like energy structures near the chemical potential of an insulator is essential to the search for a class of correlated electronic matter hosting charge-neutral fermions and Fermi surfaces, a long-proposed concept that remains elusive experimentally. Here we introduce and demonstrate that the magneto-thermoelectric response of a quantum insulator can reveal critical information not available via other approaches. We report large quantum oscillations (QOs) in the Seebeck response of the hole-doped insulating state of monolayer tungsten ditelluride (WTe2) in magnetic fields. The QOs remarkably undergo sign-changes as the field is swept, mimicking those in metals with Landau quantization. The sign-change in the thermoelectric response directly implies the presence of a field-induced Landau-level-like structure at the chemical potential of the insulator. Our results reinforce WTe2 as a platform for investigating insulating Landau levels and mobile neutral fermions in two-dimensional insulators. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.09665v1-abstract-full').style.display = 'none'; document.getElementById('2405.09665v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">19 pages, 9 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.19877">arXiv:2403.19877</a> <span> [<a href="https://arxiv.org/pdf/2403.19877">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> </div> <p class="title is-5 mathjax"> Superconductivity from On-Chip Metallization on 2D Topological Chalcogenides </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Jia%2C+Y">Yanyu Jia</a>, <a href="/search/cond-mat?searchtype=author&query=Yu%2C+G">Guo Yu</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+T">Tiancheng Song</a>, <a href="/search/cond-mat?searchtype=author&query=Yuan%2C+F">Fang Yuan</a>, <a href="/search/cond-mat?searchtype=author&query=Uzan%2C+A+J">Ayelet J Uzan</a>, <a href="/search/cond-mat?searchtype=author&query=Tang%2C+Y">Yue Tang</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+P">Pengjie Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Singha%2C+R">Ratnadwip Singha</a>, <a href="/search/cond-mat?searchtype=author&query=Onyszczak%2C+M">Michael Onyszczak</a>, <a href="/search/cond-mat?searchtype=author&query=Zheng%2C+Z+J">Zhaoyi Joy Zheng</a>, <a href="/search/cond-mat?searchtype=author&query=Watanabe%2C+K">Kenji Watanabe</a>, <a href="/search/cond-mat?searchtype=author&query=Taniguchi%2C+T">Takashi Taniguchi</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+S">Sanfeng Wu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2403.19877v2-abstract-short" style="display: inline;"> Two-dimensional (2D) transition metal dichalcogenides (TMDs) is a versatile class of quantum materials of interest to various fields including, e.g., nanoelectronics, optical devices, and topological and correlated quantum matter. Tailoring the electronic properties of TMDs is essential to their applications in many directions. Here, we report that a highly controllable and uniform on-chip 2D meta… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.19877v2-abstract-full').style.display = 'inline'; document.getElementById('2403.19877v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.19877v2-abstract-full" style="display: none;"> Two-dimensional (2D) transition metal dichalcogenides (TMDs) is a versatile class of quantum materials of interest to various fields including, e.g., nanoelectronics, optical devices, and topological and correlated quantum matter. Tailoring the electronic properties of TMDs is essential to their applications in many directions. Here, we report that a highly controllable and uniform on-chip 2D metallization process converts a class of atomically thin TMDs into robust superconductors, a property belonging to none of the starting materials. As examples, we demonstrate the introduction of superconductivity into a class of 2D air-sensitive topological TMDs, including monolayers of Td-WTe2, 1T'-MoTe2 and 2H-MoTe2, as well as their natural and twisted bilayers, metalized with an ultrathin layer of Palladium. This class of TMDs are known to exhibit intriguing topological phases ranging from topological insulator, Weyl semimetal to fractional Chern insulator. The unique, high-quality two-dimensional metallization process is based on our recent findings of the long-distance, non-Fickian in-plane mass transport and chemistry in 2D that occur at relatively low temperatures and in devices fully encapsulated with inert insulating layers. Highly compatible with existing nanofabrication techniques for van der Waals (vdW) stacks, our results offer a route to designing and engineering superconductivity and topological phases in a class of correlated 2D materials. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.19877v2-abstract-full').style.display = 'none'; document.getElementById('2403.19877v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 April, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">22 pages, 12 figures. Accepted to Physical Review X</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2312.02796">arXiv:2312.02796</a> <span> [<a href="https://arxiv.org/pdf/2312.02796">pdf</a>, <a href="https://arxiv.org/format/2312.02796">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Machine Learning">cs.LG</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Data Analysis, Statistics and Probability">physics.data-an</span> </div> </div> <p class="title is-5 mathjax"> Materials Expert-Artificial Intelligence for Materials Discovery </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Liu%2C+Y">Yanjun Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Jovanovic%2C+M">Milena Jovanovic</a>, <a href="/search/cond-mat?searchtype=author&query=Mallayya%2C+K">Krishnanand Mallayya</a>, <a href="/search/cond-mat?searchtype=author&query=Maddox%2C+W+J">Wesley J. Maddox</a>, <a href="/search/cond-mat?searchtype=author&query=Wilson%2C+A+G">Andrew Gordon Wilson</a>, <a href="/search/cond-mat?searchtype=author&query=Klemenz%2C+S">Sebastian Klemenz</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+E">Eun-Ah Kim</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2312.02796v1-abstract-short" style="display: inline;"> The advent of material databases provides an unprecedented opportunity to uncover predictive descriptors for emergent material properties from vast data space. However, common reliance on high-throughput ab initio data necessarily inherits limitations of such data: mismatch with experiments. On the other hand, experimental decisions are often guided by an expert's intuition honed from experiences… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.02796v1-abstract-full').style.display = 'inline'; document.getElementById('2312.02796v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2312.02796v1-abstract-full" style="display: none;"> The advent of material databases provides an unprecedented opportunity to uncover predictive descriptors for emergent material properties from vast data space. However, common reliance on high-throughput ab initio data necessarily inherits limitations of such data: mismatch with experiments. On the other hand, experimental decisions are often guided by an expert's intuition honed from experiences that are rarely articulated. We propose using machine learning to "bottle" such operational intuition into quantifiable descriptors using expertly curated measurement-based data. We introduce "Materials Expert-Artificial Intelligence" (ME-AI) to encapsulate and articulate this human intuition. As a first step towards such a program, we focus on the topological semimetal (TSM) among square-net materials as the property inspired by the expert-identified descriptor based on structural information: the tolerance factor. We start by curating a dataset encompassing 12 primary features of 879 square-net materials, using experimental data whenever possible. We then use Dirichlet-based Gaussian process regression using a specialized kernel to reveal composite descriptors for square-net topological semimetals. The ME-AI learned descriptors independently reproduce expert intuition and expand upon it. Specifically, new descriptors point to hypervalency as a critical chemical feature predicting TSM within square-net compounds. Our success with a carefully defined problem points to the "machine bottling human insight" approach as promising for machine learning-aided material discovery. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.02796v1-abstract-full').style.display = 'none'; document.getElementById('2312.02796v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages main text, 4 figs, 8 pages Supplementary material</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2309.05847">arXiv:2309.05847</a> <span> [<a href="https://arxiv.org/pdf/2309.05847">pdf</a>, <a href="https://arxiv.org/format/2309.05847">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.109.174112">10.1103/PhysRevB.109.174112 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Purely anharmonic charge-density wave in the 2D Dirac semimetal SnP </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Gutierrez-Amigo%2C+M">Martin Gutierrez-Amigo</a>, <a href="/search/cond-mat?searchtype=author&query=Yuan%2C+F">Fang Yuan</a>, <a href="/search/cond-mat?searchtype=author&query=Campi%2C+D">Davide Campi</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Vergniory%2C+M+G">Maia G. Vergniory</a>, <a href="/search/cond-mat?searchtype=author&query=Errea%2C+I">Ion Errea</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2309.05847v1-abstract-short" style="display: inline;"> Charge density waves (CDWs) in two-dimensional (2D) materials have been a major focus of research in condensed matter physics for several decades due to their potential for quantum-based technologies. In particular, CDWs can induce a metal-insulator transition by coupling two Dirac fermions, resulting in the emergence of a topological phase. Following this idea, here we explore the behavior of thr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.05847v1-abstract-full').style.display = 'inline'; document.getElementById('2309.05847v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2309.05847v1-abstract-full" style="display: none;"> Charge density waves (CDWs) in two-dimensional (2D) materials have been a major focus of research in condensed matter physics for several decades due to their potential for quantum-based technologies. In particular, CDWs can induce a metal-insulator transition by coupling two Dirac fermions, resulting in the emergence of a topological phase. Following this idea, here we explore the behavior of three different CDWs in a new 2D layered material, SnP, using both density functional theory calculations and experimental synthesis to study its stability. The layered structure of its bulk counterpart, Sn4P3, suggests that the structure can be synthesized down to the monolayer by exfoliation or chemical means. However, despite the stability of the bulk, the monolayer shows unstable phonons at 螕, K, and M points of the Brillouin zone, which lead to three possible charge-density-wave phases. All three CDWs lead to metastable insulating phases, with the one driven by the the active phonon in the K point being topologically non-trivial under strain. Strikingly, the ground-state structure is only revealed due to the presence of strong anharmonic effects. This, underscores the importance of studying CDWs beyond the conventional harmonic picture, where the system's ground state can be elucidated solely from the harmonic phonon spectra. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.05847v1-abstract-full').style.display = 'none'; document.getElementById('2309.05847v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 September, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review B 109, 174112 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2308.15691">arXiv:2308.15691</a> <span> [<a href="https://arxiv.org/pdf/2308.15691">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41535-024-00660-4">10.1038/s41535-024-00660-4 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Atomic-Scale Visualization of a Cascade of Magnetic Orders in the Layered Antiferromagnet $GdTe_{3}$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Raghavan%2C+A">Arjun Raghavan</a>, <a href="/search/cond-mat?searchtype=author&query=Romanelli%2C+M">Marisa Romanelli</a>, <a href="/search/cond-mat?searchtype=author&query=May-Mann%2C+J">Julian May-Mann</a>, <a href="/search/cond-mat?searchtype=author&query=Aishwarya%2C+A">Anuva Aishwarya</a>, <a href="/search/cond-mat?searchtype=author&query=Aggarwal%2C+L">Leena Aggarwal</a>, <a href="/search/cond-mat?searchtype=author&query=Singh%2C+A+G">Anisha G. Singh</a>, <a href="/search/cond-mat?searchtype=author&query=Bachmann%2C+M+D">Maja D. Bachmann</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Fradkin%2C+E">Eduardo Fradkin</a>, <a href="/search/cond-mat?searchtype=author&query=Fisher%2C+I+R">Ian R. Fisher</a>, <a href="/search/cond-mat?searchtype=author&query=Madhavan%2C+V">Vidya Madhavan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2308.15691v3-abstract-short" style="display: inline;"> $GdTe_{3}… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.15691v3-abstract-full').style.display = 'inline'; document.getElementById('2308.15691v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2308.15691v3-abstract-full" style="display: none;"> $GdTe_{3}$ is a layered antiferromagnet which has attracted attention due to its exceptionally high mobility, distinctive unidirectional incommensurate charge density wave (CDW), superconductivity under pressure, and a cascade of magnetic transitions between 7 and 12 K, with as yet unknown order parameters. Here, we use spin-polarized scanning tunneling microscopy to directly image the charge and magnetic orders in $GdTe_{3}$. Below 7 K, we find a striped antiferromagnetic phase with twice the periodicity of the Gd lattice and perpendicular to the CDW. As we heat the sample, we discover a spin density wave with the same periodicity as the CDW between 7 and 12 K; the viability of this phase is supported by our Landau free energy model. Our work reveals the order parameters of the magnetic phases in $GdTe_{3}$ and shows how the interplay between charge and spin can generate a cascade of magnetic orders. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.15691v3-abstract-full').style.display = 'none'; document.getElementById('2308.15691v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 August, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">46 pgs.; 4 main figures, 20 supplementary figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> npj Quantum Mater. 9, 47 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2308.05143">arXiv:2308.05143</a> <span> [<a href="https://arxiv.org/pdf/2308.05143">pdf</a>, <a href="https://arxiv.org/format/2308.05143">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> </div> <p class="title is-5 mathjax"> Pb$_9$Cu(PO4)$_6$(OH)$_2$: Phonon bands, Localized Flat Band Magnetism, Models, and Chemical Analysis </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Jiang%2C+Y">Yi Jiang</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+S+B">Scott B. Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Herzog-Arbeitman%2C+J">Jonah Herzog-Arbeitman</a>, <a href="/search/cond-mat?searchtype=author&query=Yu%2C+J">Jiabin Yu</a>, <a href="/search/cond-mat?searchtype=author&query=Feng%2C+X">Xiaolong Feng</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+H">Haoyu Hu</a>, <a href="/search/cond-mat?searchtype=author&query=C%C4%83lug%C4%83ru%2C+D">Dumitru C膬lug膬ru</a>, <a href="/search/cond-mat?searchtype=author&query=Brodale%2C+P+S">Parker S. Brodale</a>, <a href="/search/cond-mat?searchtype=author&query=Gormley%2C+E+L">Eoghan L. Gormley</a>, <a href="/search/cond-mat?searchtype=author&query=Vergniory%2C+M+G">Maia Garcia Vergniory</a>, <a href="/search/cond-mat?searchtype=author&query=Felser%2C+C">Claudia Felser</a>, <a href="/search/cond-mat?searchtype=author&query=Blanco-Canosa%2C+S">S. Blanco-Canosa</a>, <a href="/search/cond-mat?searchtype=author&query=Hendon%2C+C+H">Christopher H. Hendon</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Bernevig%2C+B+A">B. Andrei Bernevig</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2308.05143v2-abstract-short" style="display: inline;"> In a series of recent reports, doped lead apatite (LK-99) has been proposed as a candidate ambient temperature and pressure superconductor. However, from both an experimental and theoretical perspective, these claims are largely unsubstantiated. To this end, our synthesis and subsequent analysis of an LK-99 sample reveals a multiphase material that does not exhibit high-temperature superconductivi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.05143v2-abstract-full').style.display = 'inline'; document.getElementById('2308.05143v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2308.05143v2-abstract-full" style="display: none;"> In a series of recent reports, doped lead apatite (LK-99) has been proposed as a candidate ambient temperature and pressure superconductor. However, from both an experimental and theoretical perspective, these claims are largely unsubstantiated. To this end, our synthesis and subsequent analysis of an LK-99 sample reveals a multiphase material that does not exhibit high-temperature superconductivity. We study the structure of this phase with single-crystal X-ray diffraction (SXRD) and find a structure consistent with doped $\text{Pb}_{10}(\text{PO}_4)_6(\text{OH})_2$. However, the material is transparent which rules out a superconducting nature. From ab initio defect formation energy calculations, we find that the material likely hosts $\text{OH}^-$ anions, rather than divalent $\text{O}^{2-}$ anions, within the hexagonal channels and that Cu substitution is highly thermodynamically disfavored. Phonon spectra on the equilibrium structures reveal numerous unstable phonon modes. Together, these calculations suggest it is doubtful that Cu enters the structure in meaningful concentrations, despite initial attempts to model LK-99 in this way. However for the sake of completeness, we perform ab initio calculations of the topology, quantum geometry, and Wannier function localization in the Cu-dominated flat bands of four separate doped structures. In all cases, we find they are atomically localized by irreps, Wilson loops, and the Fubini-Study metric. It is unlikely that such bands can support strong superfluidity, and instead are susceptible to ferromagnetism (or out-of-plane antiferromagnetism) at low temperatures, which we find in ab initio studies. In sum, $\text{Pb}_{9}\text{Cu}(\text{PO}_4)_6(\text{OH})_2$ could more likely be a magnet, rather than an ambient temperature and pressure superconductor. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.05143v2-abstract-full').style.display = 'none'; document.getElementById('2308.05143v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 August, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 August, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">39 pages including appendices. Updated defect calculations and energy-dispersive X-ray spectroscopy data</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2308.00610">arXiv:2308.00610</a> <span> [<a href="https://arxiv.org/pdf/2308.00610">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/5.0160321">10.1063/5.0160321 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A Platform for Far-Infrared Spectroscopy of Quantum Materials at Millikelvin Temperatures </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Onyszczak%2C+M">Michael Onyszczak</a>, <a href="/search/cond-mat?searchtype=author&query=Uzan%2C+A+J">Ayelet J. Uzan</a>, <a href="/search/cond-mat?searchtype=author&query=Tang%2C+Y">Yue Tang</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+P">Pengjie Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Jia%2C+Y">Yanyu Jia</a>, <a href="/search/cond-mat?searchtype=author&query=Yu%2C+G">Guo Yu</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+T">Tiancheng Song</a>, <a href="/search/cond-mat?searchtype=author&query=Singha%2C+R">Ratnadwip Singha</a>, <a href="/search/cond-mat?searchtype=author&query=Khoury%2C+J+F">Jason F. Khoury</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+S">Sanfeng Wu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2308.00610v3-abstract-short" style="display: inline;"> Optical spectroscopy of quantum materials at ultralow temperatures is rarely explored, yet it may provide critical characterizations of quantum phases not possible using other approaches. We describe the development of a novel experimental platform that enables optical spectroscopic studies, together with standard electronic transport, of materials at millikelvin temperatures inside a dilution ref… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.00610v3-abstract-full').style.display = 'inline'; document.getElementById('2308.00610v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2308.00610v3-abstract-full" style="display: none;"> Optical spectroscopy of quantum materials at ultralow temperatures is rarely explored, yet it may provide critical characterizations of quantum phases not possible using other approaches. We describe the development of a novel experimental platform that enables optical spectroscopic studies, together with standard electronic transport, of materials at millikelvin temperatures inside a dilution refrigerator. The instrument is capable of measuring both bulk crystals and micron-sized two-dimensional van der Waals materials and devices. We demonstrate the performance by implementing photocurrent-based Fourier transform infrared spectroscopy on a monolayer WTe$_2$ device and a multilayer 1T-TaS$_2$ crystal, with a spectral range available from the near-infrared to the terahertz regime and in magnetic fields up to 5 T. In the far-infrared regime, we achieve spectroscopic measurements at a base temperature as low as ~ 43 mK and a sample electron temperature of ~ 450 mK. Possible experiments and potential future upgrades of this versatile instrumental platform are envisioned. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.00610v3-abstract-full').style.display = 'none'; document.getElementById('2308.00610v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 August, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 August, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">14 pages, 6 figures, typos corrected</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2307.15881">arXiv:2307.15881</a> <span> [<a href="https://arxiv.org/pdf/2307.15881">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41467-023-42821-2">10.1038/s41467-023-42821-2 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Evidence for Two Dimensional Anisotropic Luttinger Liquids at Millikelvin Temperatures </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Yu%2C+G">Guo Yu</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+P">Pengjie Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Uzan%2C+A+J">Ayelet J. Uzan</a>, <a href="/search/cond-mat?searchtype=author&query=Jia%2C+Y">Yanyu Jia</a>, <a href="/search/cond-mat?searchtype=author&query=Onyszczak%2C+M">Michael Onyszczak</a>, <a href="/search/cond-mat?searchtype=author&query=Singha%2C+R">Ratnadwip Singha</a>, <a href="/search/cond-mat?searchtype=author&query=Gui%2C+X">Xin Gui</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+T">Tiancheng Song</a>, <a href="/search/cond-mat?searchtype=author&query=Tang%2C+Y">Yue Tang</a>, <a href="/search/cond-mat?searchtype=author&query=Watanabe%2C+K">Kenji Watanabe</a>, <a href="/search/cond-mat?searchtype=author&query=Taniguchi%2C+T">Takashi Taniguchi</a>, <a href="/search/cond-mat?searchtype=author&query=Cava%2C+R+J">Robert J. Cava</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+S">Sanfeng Wu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2307.15881v1-abstract-short" style="display: inline;"> While Landau's Fermi liquid theory provides the standard description for two- and three-dimensional (2D/3D) conductors, the physics of interacting one-dimensional (1D) conductors is governed by the distinct Luttinger liquid (LL) theory. Can a LL-like state, in which electronic excitations are fractionalized modes, emerge in a 2D system as a stable zero-temperature phase? This long-standing questio… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.15881v1-abstract-full').style.display = 'inline'; document.getElementById('2307.15881v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2307.15881v1-abstract-full" style="display: none;"> While Landau's Fermi liquid theory provides the standard description for two- and three-dimensional (2D/3D) conductors, the physics of interacting one-dimensional (1D) conductors is governed by the distinct Luttinger liquid (LL) theory. Can a LL-like state, in which electronic excitations are fractionalized modes, emerge in a 2D system as a stable zero-temperature phase? This long-standing question, first brought up by Anderson decades ago, is crucial in the study of non-Fermi liquids but remains unsettled. A recent experiment identified a moir茅 superlattice of twisted bilayer tungsten ditelluride (tWTe_2) with a small interlayer twist angle as a 2D host of the LL physics at temperatures of a few kelvins. Here we report experimental evidence for a 2D anisotropic LL state in a substantially reduced temperature regime, down to at least 50 mK, spontaneously formed in a tWTe_2 system with a twist angle of ~ 3 degree. While the system is metallic-like and nearly isotropic above 2 K, a dramatically enhanced electronic anisotropy develops in the millikelvin regime, featuring distinct transport behaviors along two orthogonal in-plane directions. In the strongly anisotropic phase, we observe transport characteristics of a 2D LL phase, i.e., the universal power law scaling behaviors in across-wire conductance and a zero-bias dip in the differential resistance along the wire direction. Our results represent a step forward in the search for stable LL physics beyond 1D and related unconventional quantum matter. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.15881v1-abstract-full').style.display = 'none'; document.getElementById('2307.15881v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 July, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">24 pages, 4 main figures and 10 extended data figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Communications 14, 7025 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2307.06477">arXiv:2307.06477</a> <span> [<a href="https://arxiv.org/pdf/2307.06477">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s44160-023-00442-z">10.1038/s44160-023-00442-z <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Surface-Confined Two-Dimensional Crystal Growth on a Monolayer </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Jia%2C+Y">Yanyu Jia</a>, <a href="/search/cond-mat?searchtype=author&query=Yuan%2C+F">Fang Yuan</a>, <a href="/search/cond-mat?searchtype=author&query=Cheng%2C+G">Guangming Cheng</a>, <a href="/search/cond-mat?searchtype=author&query=Tang%2C+Y">Yue Tang</a>, <a href="/search/cond-mat?searchtype=author&query=Yu%2C+G">Guo Yu</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+T">Tiancheng Song</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+P">Pengjie Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Singha%2C+R">Ratnadwip Singha</a>, <a href="/search/cond-mat?searchtype=author&query=Uzan%2C+A+J">Ayelet July Uzan</a>, <a href="/search/cond-mat?searchtype=author&query=Onyszczak%2C+M">Michael Onyszczak</a>, <a href="/search/cond-mat?searchtype=author&query=Watanabe%2C+K">Kenji Watanabe</a>, <a href="/search/cond-mat?searchtype=author&query=Taniguchi%2C+T">Takashi Taniguchi</a>, <a href="/search/cond-mat?searchtype=author&query=Yao%2C+N">Nan Yao</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+S">Sanfeng Wu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2307.06477v1-abstract-short" style="display: inline;"> Conventional vapor deposition or epitaxial growth of two-dimensional (2D) materials and heterostructures is conducted in a large chamber in which masses transport from the source to the substrate. Here we report a chamber-free, on-chip approach for growing a 2D crystalline structures directly in a nanoscale surface-confined 2D space. The method is based on a surprising discovery of a rapid, long-d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.06477v1-abstract-full').style.display = 'inline'; document.getElementById('2307.06477v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2307.06477v1-abstract-full" style="display: none;"> Conventional vapor deposition or epitaxial growth of two-dimensional (2D) materials and heterostructures is conducted in a large chamber in which masses transport from the source to the substrate. Here we report a chamber-free, on-chip approach for growing a 2D crystalline structures directly in a nanoscale surface-confined 2D space. The method is based on a surprising discovery of a rapid, long-distance, non-Fickian transport of a uniform layer of atomically thin palladium (Pd) on a monolayer crystal of tungsten ditelluride (WTe2), at temperatures well below the known melting points of all materials involved. The resulting nanoconfined growth realizes a controlled formation of a stable new 2D crystalline material, Pd7WTe2 , when the monolayer seed is either free-standing or fully encapsulated in a van der Waals stack. The approach is generalizable and highly compatible with nanodevice fabrication, promising to expand the library of 2D materials and their functionalities. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.06477v1-abstract-full').style.display = 'none'; document.getElementById('2307.06477v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 July, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nat. Synth (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.06540">arXiv:2303.06540</a> <span> [<a href="https://arxiv.org/pdf/2303.06540">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41567-023-02291-1">10.1038/s41567-023-02291-1 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Unconventional Superconducting Quantum Criticality in Monolayer WTe2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Song%2C+T">Tiancheng Song</a>, <a href="/search/cond-mat?searchtype=author&query=Jia%2C+Y">Yanyu Jia</a>, <a href="/search/cond-mat?searchtype=author&query=Yu%2C+G">Guo Yu</a>, <a href="/search/cond-mat?searchtype=author&query=Tang%2C+Y">Yue Tang</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+P">Pengjie Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Singha%2C+R">Ratnadwip Singha</a>, <a href="/search/cond-mat?searchtype=author&query=Gui%2C+X">Xin Gui</a>, <a href="/search/cond-mat?searchtype=author&query=Uzan%2C+A+J">Ayelet J. Uzan</a>, <a href="/search/cond-mat?searchtype=author&query=Onyszczak%2C+M">Michael Onyszczak</a>, <a href="/search/cond-mat?searchtype=author&query=Watanabe%2C+K">Kenji Watanabe</a>, <a href="/search/cond-mat?searchtype=author&query=Taniguchi%2C+T">Takashi Taniguchi</a>, <a href="/search/cond-mat?searchtype=author&query=Cava%2C+R+J">Robert J. Cava</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Ong%2C+N+P">N. P. Ong</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+S">Sanfeng Wu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2303.06540v2-abstract-short" style="display: inline;"> The superconductor to insulator or metal transition in two dimensions (2D) provides a valuable platform for studying continuous quantum phase transitions (QPTs) and critical phenomena. Distinct theoretical models, including both fermionic and bosonic localization scenarios, have been developed, but many questions remain unsettled despite decades of research. Extending Nernst experiments down to mi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.06540v2-abstract-full').style.display = 'inline'; document.getElementById('2303.06540v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.06540v2-abstract-full" style="display: none;"> The superconductor to insulator or metal transition in two dimensions (2D) provides a valuable platform for studying continuous quantum phase transitions (QPTs) and critical phenomena. Distinct theoretical models, including both fermionic and bosonic localization scenarios, have been developed, but many questions remain unsettled despite decades of research. Extending Nernst experiments down to millikelvin temperatures, we uncover anomalous quantum fluctuations and identify an unconventional superconducting quantum critical point (QCP) in a gate-tuned excitonic quantum spin Hall insulator (QSHI), the monolayer tungsten ditelluride (WTe2). The observed vortex Nernst effect reveals singular superconducting fluctuations in the resistive normal state induced by magnetic fields or temperature, even well above the transition. Near the doping-induced QCP, the Nernst signal driven by quantum fluctuations is exceptionally large in the millikelvin regime, with a coefficient of ~ 4,100 uV/KT at zero magnetic field, an indication of the proliferation of vortices. Surprisingly, the Nernst signal abruptly disappears when the doping falls below the critical value, in striking conflict with conventional expectations. This series of phenomena, which have no prior analogue, call for careful examinations of the mechanism of the QCP, including the possibility of a continuous QPT between two distinct ordered phases in the monolayer. Our experiments open a new avenue for studying unconventional QPTs and quantum critical matter. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.06540v2-abstract-full').style.display = 'none'; document.getElementById('2303.06540v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2301.13690">arXiv:2301.13690</a> <span> [<a href="https://arxiv.org/pdf/2301.13690">pdf</a>, <a href="https://arxiv.org/format/2301.13690">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Ultrafast Dynamics of the Topological Semimetal GdSb$_{x}$Te$_{2-x-未}$ In the Presence and Absence of a Charge Density Wave </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kirby%2C+R+J">Robert J. Kirby</a>, <a href="/search/cond-mat?searchtype=author&query=Montanaro%2C+A">Angela Montanaro</a>, <a href="/search/cond-mat?searchtype=author&query=Giusti%2C+F">Francesca Giusti</a>, <a href="/search/cond-mat?searchtype=author&query=Koch-Liston%2C+A">Andr茅 Koch-Liston</a>, <a href="/search/cond-mat?searchtype=author&query=Lei%2C+S">Shiming Lei</a>, <a href="/search/cond-mat?searchtype=author&query=Petrides%2C+I">Ioannis Petrides</a>, <a href="/search/cond-mat?searchtype=author&query=Narang%2C+P">Prineha Narang</a>, <a href="/search/cond-mat?searchtype=author&query=Burch%2C+K+S">Kenneth S. Burch</a>, <a href="/search/cond-mat?searchtype=author&query=Fausti%2C+D">Daniele Fausti</a>, <a href="/search/cond-mat?searchtype=author&query=Scholes%2C+G+D">Gregory D. Scholes</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2301.13690v1-abstract-short" style="display: inline;"> Time-resolved dynamics in charge-density-wave materials have revealed interesting out-of-equilibrium electronic responses. However these are typically only performed in a single material possessing a CDW. As such, it is challenging to separate subtle effects originating from the CDW. Here, we report on the ultrafast dynamics of the GdSb$_{x}$Te$_{2-x-未}$ series of materials where E$_{F}$ can be tu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.13690v1-abstract-full').style.display = 'inline'; document.getElementById('2301.13690v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2301.13690v1-abstract-full" style="display: none;"> Time-resolved dynamics in charge-density-wave materials have revealed interesting out-of-equilibrium electronic responses. However these are typically only performed in a single material possessing a CDW. As such, it is challenging to separate subtle effects originating from the CDW. Here, we report on the ultrafast dynamics of the GdSb$_{x}$Te$_{2-x-未}$ series of materials where E$_{F}$ can be tuned, resulting in a change from an undistorted tetraganal phase to a CDW with a wavevector that depends on $x$. Using mid-infrared, near-infrared, and visible excitation, we find the dynamics are sensitive to both E$_{F}$ and the presence of the CDW. Specifically, as the Sb content of the compounds increases, transient spectral features shift to higher probe energies. In addition, we observe an enhanced lifetime and change in the sign of the transient signal upon removing the CDW with high Sb concentrations. Finally, we reveal fluence- and temperature-dependent photo-induced responses of the differential reflectivity, which provide evidence of transient charge density wave suppression in related telluride materials. Taken together our results provide a blueprint for future ultrafast studies of CDW systems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.13690v1-abstract-full').style.display = 'none'; document.getElementById('2301.13690v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 31 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2301.13102">arXiv:2301.13102</a> <span> [<a href="https://arxiv.org/pdf/2301.13102">pdf</a>, <a href="https://arxiv.org/format/2301.13102">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> </div> <p class="title is-5 mathjax"> Charge density wave-templated spin cycloid in topological semimetal $NdSb_{x}Te_{2-x-未}$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Salters%2C+T+H">Tyger H. Salters</a>, <a href="/search/cond-mat?searchtype=author&query=Orlandi%2C+F">Fabio Orlandi</a>, <a href="/search/cond-mat?searchtype=author&query=Berry%2C+T">Tanya Berry</a>, <a href="/search/cond-mat?searchtype=author&query=Khoury%2C+J+F">Jason F. Khoury</a>, <a href="/search/cond-mat?searchtype=author&query=Whittaker%2C+E">Ethan Whittaker</a>, <a href="/search/cond-mat?searchtype=author&query=Manuel%2C+P">Pascal Manuel</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2301.13102v1-abstract-short" style="display: inline;"> Magnetic topological semimetals present open questions regarding the interplay of crystal symmetry, magnetism, band topology, and electron correlations. $LnSb_{x}Te_{2-x-未}$ (Ln= lanthanide) is a family of square-net-derived topological semimetals that allows compositional control of band filling, and access to different topological states via an evolving charge density wave (CDW) distortion. Prev… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.13102v1-abstract-full').style.display = 'inline'; document.getElementById('2301.13102v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2301.13102v1-abstract-full" style="display: none;"> Magnetic topological semimetals present open questions regarding the interplay of crystal symmetry, magnetism, band topology, and electron correlations. $LnSb_{x}Te_{2-x-未}$ (Ln= lanthanide) is a family of square-net-derived topological semimetals that allows compositional control of band filling, and access to different topological states via an evolving charge density wave (CDW) distortion. Previously studied Gd and Ce members containing a CDW have shown complex magnetic phase diagrams, which implied that spins localized on Ln interact with the CDW, but to this date, no magnetic structures have been solved within the CDW regime of this family of compounds. Here, we report on the interplay of the CDW with magnetism in $NdSb_{x}Te_{2-x-未}$, by comparing the undistorted square net member $NdSb_{0.94}Te_{0.92}$ with the CDW-distorted phase $NdSb_{0.48}Te_{1.37}$, via single-crystal x-ray diffraction, magnetometry, heat capacity, and neutron powder diffraction. $NdSb_{0.94}Te_{0.92}$ is a collinear antiferromagnet with $T_N$ $\sim$ 2.7 K, where spins align antiparallel to each other, but parallel to the square net of the nuclear structure. $NdSb_{0.48}Te_{1.37}$ exhibits a nearly five-fold modulated CDW ($q_{CDW}=0.18b^*$), isostructural to other $LnSb_{x}Te_{2-x-未}$ at similar x. $NdSb_{0.48}Te_{1.37}$ displays more complex magnetism with $T_N = 2.3 K$, additional metamagnetic transitions, and an elliptical cycloid magnetic structure with $q_{mag}=-0.41b^*$.The magnitudes of $q_{CDW}$ and $q_{mag}$ exhibit a integer relationship, $1+2q_{mag}=q_{CDW}$, implying a coupling between the CDW and magnetic structure. Given that the CDW is localized within the nonmagnetic distorted square net, we propose that conduction electrons "template" the spin modulation via the Ruderman-Kittel-Kasuya-Yosida interaction. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.13102v1-abstract-full').style.display = 'none'; document.getElementById('2301.13102v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">25 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2212.13688">arXiv:2212.13688</a> <span> [<a href="https://arxiv.org/pdf/2212.13688">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1021/acs.nanolett.2c05100">10.1021/acs.nanolett.2c05100 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Atomically Sharp Internal Interface in a Chiral Weyl Semimetal Nanowire </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Mathur%2C+N">Nitish Mathur</a>, <a href="/search/cond-mat?searchtype=author&query=Yuan%2C+F">Fang Yuan</a>, <a href="/search/cond-mat?searchtype=author&query=Cheng%2C+G">Guangming Cheng</a>, <a href="/search/cond-mat?searchtype=author&query=Kaushik%2C+S">Sahal Kaushik</a>, <a href="/search/cond-mat?searchtype=author&query=Robredo%2C+I">I帽igo Robredo</a>, <a href="/search/cond-mat?searchtype=author&query=Vergniory%2C+M+G">Maia G. Vergniory</a>, <a href="/search/cond-mat?searchtype=author&query=Cano%2C+J">Jennifer Cano</a>, <a href="/search/cond-mat?searchtype=author&query=Yao%2C+N">Nan Yao</a>, <a href="/search/cond-mat?searchtype=author&query=Jin%2C+S">Song Jin</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2212.13688v1-abstract-short" style="display: inline;"> Internal interfaces in Weyl semimetals (WSMs) are predicted to host distinct topological features that are different from the commonly studied external interfaces (crystal-to-vacuum boundaries). However, the lack of atomically sharp and crystallographically oriented internal interfaces in WSMs makes it difficult to experimentally investigate hidden topological states buried inside the material. He… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.13688v1-abstract-full').style.display = 'inline'; document.getElementById('2212.13688v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2212.13688v1-abstract-full" style="display: none;"> Internal interfaces in Weyl semimetals (WSMs) are predicted to host distinct topological features that are different from the commonly studied external interfaces (crystal-to-vacuum boundaries). However, the lack of atomically sharp and crystallographically oriented internal interfaces in WSMs makes it difficult to experimentally investigate hidden topological states buried inside the material. Here, we study a unique internal interface known as merohedral twin boundary in chemically synthesized single-crystal nanowires (NWs) of CoSi, a chiral WSM of space group P213 (No. 198). High resolution scanning transmission electron microscopy reveals that this internal interface is (001) twin plane and connects two enantiomeric counterparts at an atomically sharp interface with inversion twinning. Ab-initio calculations show localized internal Fermi arcs at the (001) twin boundary that can be clearly distinguished from both external Fermi arcs and bulk states. These merohedrally twinned CoSi NWs provide an ideal material system to probe unexplored topological properties associated with internal interfaces in WSMs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.13688v1-abstract-full').style.display = 'none'; document.getElementById('2212.13688v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">19 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2209.04226">arXiv:2209.04226</a> <span> [<a href="https://arxiv.org/pdf/2209.04226">pdf</a>, <a href="https://arxiv.org/format/2209.04226">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.107.L161103">10.1103/PhysRevB.107.L161103 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Charge density wave-generated Fermi surfaces in NdTe$_3$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Chikina%2C+A">Alla Chikina</a>, <a href="/search/cond-mat?searchtype=author&query=Lund%2C+H">Henriette Lund</a>, <a href="/search/cond-mat?searchtype=author&query=Bianchi%2C+M">Marco Bianchi</a>, <a href="/search/cond-mat?searchtype=author&query=Curcio%2C+D">Davide Curcio</a>, <a href="/search/cond-mat?searchtype=author&query=Dalgaard%2C+K+J">Kirstine J. Dalgaard</a>, <a href="/search/cond-mat?searchtype=author&query=Bremholm%2C+M">Martin Bremholm</a>, <a href="/search/cond-mat?searchtype=author&query=Lei%2C+S">Shiming Lei</a>, <a href="/search/cond-mat?searchtype=author&query=Singha%2C+R">Ratnadwip Singha</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Hofmann%2C+P">Philip Hofmann</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2209.04226v1-abstract-short" style="display: inline;"> The electronic structure of NdTe$_3$ in the charge density wave phase (CDW) is investigated by angle-resolved photoemission spectroscopy. The combination of high-quality crystals and careful surface preparation reveals subtle and previously unobserved details in the Fermi surface topology, allowing an interpretation of the rich and unexplained quantum oscillations in the rare earth tritellurides R… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.04226v1-abstract-full').style.display = 'inline'; document.getElementById('2209.04226v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2209.04226v1-abstract-full" style="display: none;"> The electronic structure of NdTe$_3$ in the charge density wave phase (CDW) is investigated by angle-resolved photoemission spectroscopy. The combination of high-quality crystals and careful surface preparation reveals subtle and previously unobserved details in the Fermi surface topology, allowing an interpretation of the rich and unexplained quantum oscillations in the rare earth tritellurides RTe$_3$. In particular, several closed Fermi surface elements can be observed that are related to CDW-induced replicas of the original bands, leading to the curious situation in which a CDW does not only remove Fermi surface elements but creates new ones that are observable in transport experiments. Moreover, a large residual Fermi surface is found in the CDW gap, very close to the position of the gapped normal-state Fermi surface. Its area agrees very well with high-frequency quantum oscillations in NdTe$_3$ and its presence is explained by strong electron-phonon coupling combined with the quasi one-dimensional character of the CDW. Finally, we identify the origin of the low-frequency $伪$ quantum oscillations ubiquitous for the lighter R elements in the RTe$_3$ family and responsible for the high mobility in these compounds. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2209.04226v1-abstract-full').style.display = 'none'; document.getElementById('2209.04226v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 September, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2208.05466">arXiv:2208.05466</a> <span> [<a href="https://arxiv.org/pdf/2208.05466">pdf</a>, <a href="https://arxiv.org/format/2208.05466">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1126/sciadv.adh0145">10.1126/sciadv.adh0145 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Colossal negative magnetoresistance in the complex charge density wave regime of an antiferromagnetic Dirac semimetal </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Singha%2C+R">Ratnadwip Singha</a>, <a href="/search/cond-mat?searchtype=author&query=Dalgaard%2C+K+J">Kirstine J. Dalgaard</a>, <a href="/search/cond-mat?searchtype=author&query=Marchenko%2C+D">Dmitry Marchenko</a>, <a href="/search/cond-mat?searchtype=author&query=Krivenkov%2C+M">Maxim Krivenkov</a>, <a href="/search/cond-mat?searchtype=author&query=Rienks%2C+E+D+L">Emile D. L. Rienks</a>, <a href="/search/cond-mat?searchtype=author&query=Jovanovic%2C+M">Milena Jovanovic</a>, <a href="/search/cond-mat?searchtype=author&query=Teicher%2C+S+M+L">Samuel M. L. Teicher</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+J">Jiayi Hu</a>, <a href="/search/cond-mat?searchtype=author&query=Salters%2C+T+H">Tyger H. Salters</a>, <a href="/search/cond-mat?searchtype=author&query=Lin%2C+J">Jingjing Lin</a>, <a href="/search/cond-mat?searchtype=author&query=Varykhalov%2C+A">Andrei Varykhalov</a>, <a href="/search/cond-mat?searchtype=author&query=Ong%2C+N+P">N. Phuan Ong</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2208.05466v1-abstract-short" style="display: inline;"> Colossal magnetoresistance (MR) is a well-known phenomenon, notably observed in hole-doped ferromagnetic manganites. It remains a major research topic due to its potential in technological applications. Though topological semimetals also show large MR, its origin and nature are completely different. Here, we show that in the highly electron doped region, the Dirac semimetal CeSbTe demonstrates sim… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.05466v1-abstract-full').style.display = 'inline'; document.getElementById('2208.05466v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2208.05466v1-abstract-full" style="display: none;"> Colossal magnetoresistance (MR) is a well-known phenomenon, notably observed in hole-doped ferromagnetic manganites. It remains a major research topic due to its potential in technological applications. Though topological semimetals also show large MR, its origin and nature are completely different. Here, we show that in the highly electron doped region, the Dirac semimetal CeSbTe demonstrates similar properties as the manganites. CeSb$_{0.11}$Te$_{1.90}$ hosts multiple charge density wave (CDW) modulation-vectors and has a complex magnetic phase diagram. We confirm that this compound is an antiferromagnetic Dirac semimetal. Despite having a metallic Fermi surface, the electronic transport properties are semiconductor-like and deviate from known theoretical models. An external magnetic field induces a semiconductor-metal-like transition, which results in a colossal negative MR. Moreover, signatures of the coupling between the CDW and a spin modulation are observed in resistivity. This spin modulation also produces a giant anomalous Hall response. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.05466v1-abstract-full').style.display = 'none'; document.getElementById('2208.05466v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 August, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 13 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Science Advances 9, eadh0145 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2208.00933">arXiv:2208.00933</a> <span> [<a href="https://arxiv.org/pdf/2208.00933">pdf</a>, <a href="https://arxiv.org/format/2208.00933">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Eavesdropping on competing condensates by the edge supercurrent in a Weyl superconductor </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Stephan Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Lei%2C+S">Shiming Lei</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Cava%2C+R+J">R. J. Cava</a>, <a href="/search/cond-mat?searchtype=author&query=Ong%2C+N+P">N. P. Ong</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2208.00933v3-abstract-short" style="display: inline;"> In a topological insulator the metallic surface states are easily distinguished from the insulating bulk states (FuKane07). By contrast, in a topological superconductor (FuKane08,Qi,FuBerg,Oppen), much less is known about the relationship between an edge supercurrent and the bulk pair condensate. Can we force their pairing symmetries to be incompatible? In the superconducting state of the Weyl sem… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.00933v3-abstract-full').style.display = 'inline'; document.getElementById('2208.00933v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2208.00933v3-abstract-full" style="display: none;"> In a topological insulator the metallic surface states are easily distinguished from the insulating bulk states (FuKane07). By contrast, in a topological superconductor (FuKane08,Qi,FuBerg,Oppen), much less is known about the relationship between an edge supercurrent and the bulk pair condensate. Can we force their pairing symmetries to be incompatible? In the superconducting state of the Weyl semimetal MoTe$_2$, an edge supercurrent is observed as oscillations in the current-voltage (\emph{I-V}) curves induced by fluxoid quantization (Wang). We have found that the $s$-wave pairing potential of supercurrent injected from niobium contacts is incompatible with the intrinsic pair condensate in MoTe$_2$. The incompatibility leads to strong stochasticity in the switching current $I_c$ as well as other anomalous properties such as an unusual antihysteretic behavior of the ``wrong'' sign. Under supercurrent injection, the fluxoid-induced edge oscillations survive to much higher magnetic fields \emph{H}. Interestingly, the oscillations are either very noisy or noise-free depending on the pair potential that ends up dictating the edge pairing. Using the phase noise as a sensitive probe that eavesdrops on the competiting bulk states, we uncover an underlying blockade mechanism whereby the intrinsic condensate can pre-emptively block proximitization by the Nb pair potential depending on the history. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.00933v3-abstract-full').style.display = 'none'; document.getElementById('2208.00933v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 August, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 6 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2207.14109">arXiv:2207.14109</a> <span> [<a href="https://arxiv.org/pdf/2207.14109">pdf</a>, <a href="https://arxiv.org/format/2207.14109">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Transport signatures of Fermi arcs at twin boundaries in Weyl materials </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kaushik%2C+S">Sahal Kaushik</a>, <a href="/search/cond-mat?searchtype=author&query=Robredo%2C+I">I帽igo Robredo</a>, <a href="/search/cond-mat?searchtype=author&query=Mathur%2C+N">Nitish Mathur</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Jin%2C+S">Song Jin</a>, <a href="/search/cond-mat?searchtype=author&query=Vergniory%2C+M+G">Maia G. Vergniory</a>, <a href="/search/cond-mat?searchtype=author&query=Cano%2C+J">Jennifer Cano</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2207.14109v1-abstract-short" style="display: inline;"> One of the most striking signatures of Weyl fermions is their surface Fermi arcs. Less known is that Fermi arcs can also be localized at internal twin boundaries where two Weyl materials of opposite chirality meet. In this work, we derive constraints on the topology and connectivity of these "internal Fermi arcs." We show that internal Fermi arcs can exhibit transport signatures and propose two pr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.14109v1-abstract-full').style.display = 'inline'; document.getElementById('2207.14109v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.14109v1-abstract-full" style="display: none;"> One of the most striking signatures of Weyl fermions is their surface Fermi arcs. Less known is that Fermi arcs can also be localized at internal twin boundaries where two Weyl materials of opposite chirality meet. In this work, we derive constraints on the topology and connectivity of these "internal Fermi arcs." We show that internal Fermi arcs can exhibit transport signatures and propose two probes: quantum oscillations and a quantized chiral magnetic current. We propose merohedrally twinned B20 materials as candidates to host internal Fermi arcs, verified through both model and ab initio calculations. Our theoretical investigation sheds lights on the topological features and motivates experimental studies into the intriguing physics of internal Fermi arcs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.14109v1-abstract-full').style.display = 'none'; document.getElementById('2207.14109v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2206.01648">arXiv:2206.01648</a> <span> [<a href="https://arxiv.org/pdf/2206.01648">pdf</a>, <a href="https://arxiv.org/format/2206.01648">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> </div> <p class="title is-5 mathjax"> Synthesis of an aqueous, air-stable, superconducting 1T'-WS$_2$ monolayer-ink </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Song%2C+X">Xiaoyu Song</a>, <a href="/search/cond-mat?searchtype=author&query=Singha%2C+R">Ratnadwip Singha</a>, <a href="/search/cond-mat?searchtype=author&query=Cheng%2C+G">Guangming Cheng</a>, <a href="/search/cond-mat?searchtype=author&query=Yeh%2C+Y">Yao-Wen Yeh</a>, <a href="/search/cond-mat?searchtype=author&query=Kamm%2C+F">Franziska Kamm</a>, <a href="/search/cond-mat?searchtype=author&query=Khoury%2C+J+F">Jason F. Khoury</a>, <a href="/search/cond-mat?searchtype=author&query=Pielnhofer%2C+F">Florian Pielnhofer</a>, <a href="/search/cond-mat?searchtype=author&query=Batson%2C+P+E">Philip E. Batson</a>, <a href="/search/cond-mat?searchtype=author&query=Yao%2C+N">Nan Yao</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2206.01648v1-abstract-short" style="display: inline;"> Liquid-phase chemical exfoliation is ideal to achieve industry scale production of two-dimensional (2D) materials for a wide range of application such as printable electronics, catalysis and energy storage. However, many impactful 2D materials with potentials in quantum technologies can only be studied in lab settings due to their air-sensitivity, and loss of physical performance after chemical pr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2206.01648v1-abstract-full').style.display = 'inline'; document.getElementById('2206.01648v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2206.01648v1-abstract-full" style="display: none;"> Liquid-phase chemical exfoliation is ideal to achieve industry scale production of two-dimensional (2D) materials for a wide range of application such as printable electronics, catalysis and energy storage. However, many impactful 2D materials with potentials in quantum technologies can only be studied in lab settings due to their air-sensitivity, and loss of physical performance after chemical processing. Here, we report a simple chemical exfoliation method to create a stable, aqueous, surfactant-free, superconducting ink containing phase-pure 1T'-WS$_2$ monolayers that are isotructural to the air-sensitive topological insulator 1T'-WTe$_2$. We demonstrate that thin films can be cast on both hard and flexible substrates. The printed film is metallic at room temperature and superconducting below 7.3 K, shows strong anisotropic unconventional superconducting behavior with an in-plane and out-of-plane upper critical magnetic field of 30.1 T and 5.3 T, has a critical current of 44 mA, and is stable at ambient conditions for at least 30 days. Our results show that chemical processing can provide an engineering solution, which makes non-trivial 2D materials that used to be only studied in laboratories commercially accessible. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2206.01648v1-abstract-full').style.display = 'none'; document.getElementById('2206.01648v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 June, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">19 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.12690">arXiv:2203.12690</a> <span> [<a href="https://arxiv.org/pdf/2203.12690">pdf</a>, <a href="https://arxiv.org/format/2203.12690">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1021/jacs.2c02281">10.1021/jacs.2c02281 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A Class of Magnetic Topological Material Candidates with Hypervalent Bi Chains </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Khoury%2C+J+F">Jason F. Khoury</a>, <a href="/search/cond-mat?searchtype=author&query=Han%2C+B">Bingzheng Han</a>, <a href="/search/cond-mat?searchtype=author&query=Jovanovic%2C+M">Milena Jovanovic</a>, <a href="/search/cond-mat?searchtype=author&query=Singha%2C+R">Ratnadwip Singha</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+X">Xiaoyu Song</a>, <a href="/search/cond-mat?searchtype=author&query=Queiroz%2C+R">Raquel Queiroz</a>, <a href="/search/cond-mat?searchtype=author&query=Ong%2C+N+P">N. Phuan Ong</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2203.12690v3-abstract-short" style="display: inline;"> The link between crystal and electronic structure is crucial for understanding structure-property relations in solid-state chemistry. In particular, it has been instrumental in understanding topological materials, where electrons behave differently than they would in conventional solids. Herein, we identify 1D Bi chains as a structural motif of interest for topological materials. We focus on Sm… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.12690v3-abstract-full').style.display = 'inline'; document.getElementById('2203.12690v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.12690v3-abstract-full" style="display: none;"> The link between crystal and electronic structure is crucial for understanding structure-property relations in solid-state chemistry. In particular, it has been instrumental in understanding topological materials, where electrons behave differently than they would in conventional solids. Herein, we identify 1D Bi chains as a structural motif of interest for topological materials. We focus on Sm$_3$ZrBi$_5$, a new quasi-one-dimensional (1D) compound in the Ln$_3$MPn$_5$ (Ln = lanthanide; M = metal; Pn = pnictide) family that crystallizes in the P$6_{3}$/mcm space group. Density functional theory calculations indicate a complex, topologically non-trivial electronic structure that changes significantly in the presence of spin-orbit coupling. Magnetic measurements show a quasi-1D antiferromagnetic structure with two magnetic transitions at 11.7 and 10.7 K that are invariant to applied field up to 9 T, indicating magnetically frustrated spins. Heat capacity, electrical, and thermal transport measurements support this claim and suggest complex scattering behavior in Sm$_3$ZrBi$_5$. This work highlights 1D chains as an unexplored structural motif for identifying topological materials, as well as the potential for rich physical phenomena in the Ln$_3$MPn$_5$ family. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.12690v3-abstract-full').style.display = 'none'; document.getElementById('2203.12690v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">43 pages, 13 figures. Updated to add one reference and correct error in Figure 3</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2112.04397">arXiv:2112.04397</a> <span> [<a href="https://arxiv.org/pdf/2112.04397">pdf</a>, <a href="https://arxiv.org/format/2112.04397">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1073/pnas.2204468119">10.1073/pnas.2204468119 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Phase tuning of multiple Andreev reflections of Dirac fermions and the Josephson supercurrent in Al-MoTe2-Al junctions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+Z">Zheyi Zhu</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Stephan Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Lei%2C+S">Shiming Lei</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Cava%2C+R+J">R. J. Cava</a>, <a href="/search/cond-mat?searchtype=author&query=Ong%2C+N+P">N. P. Ong</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2112.04397v1-abstract-short" style="display: inline;"> When a normal metal $N$ is sandwiched between two superconductors, the energy gaps in the latter act as walls that confine electrons in $N$ in a square-well potential. If the voltage $V$ across $N$ is finite, an electron injected into the well undergoes multiple Andreev reflections (MAR) until it gains enough energy to overcome the energy barrier. Because each reflection converts an electron to a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.04397v1-abstract-full').style.display = 'inline'; document.getElementById('2112.04397v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2112.04397v1-abstract-full" style="display: none;"> When a normal metal $N$ is sandwiched between two superconductors, the energy gaps in the latter act as walls that confine electrons in $N$ in a square-well potential. If the voltage $V$ across $N$ is finite, an electron injected into the well undergoes multiple Andreev reflections (MAR) until it gains enough energy to overcome the energy barrier. Because each reflection converts an electron to a hole (or vice versa), while creating (or destroying) a Cooper pair, the MAR process shuttles a stream of pairs across the junction. An interesting question is, given a finite $V$, what percentage of the shuttled pairs end up as a Josephson supercurrent? This fraction does not seem to have been measured. Here we show that, in high-transparency junctions based on the type II Dirac semimetal MoTe$_2$, the MAR leads to a stair-case profile in the current-voltage ($I$-$V$) response, corresponding to pairs shuttled incoherently by the $n^{th}$-order process. By varying the phase $\varphi$ across the junction, we demonstrate that a Josephson supercurrent ${\bf J}_{\rm s}\sim \sin\varphi$ co-exists with the MAR steps, even at large $V$. The observed linear increase in the amplitude of ${\bf J}_{\rm s}$ with $n$ (for small $n$) implies that ${\bf J}_{\rm s}$ originates from the population of pairs that are coherently shuttled. We infer that the MAR steps and the supercurrent are complementary aspects of the Andreev process. The experiment yields the percentage of shuttled pairs that form the supercurrent. At large $V$, the coherent fraction is initially linear in $n$. However, as $V\to 0$ ($n\gg 1$), almost all the pairs end up as the observed Josephson supercurrent. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.04397v1-abstract-full').style.display = 'none'; document.getElementById('2112.04397v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 December, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PNAS 119, e2204468119 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2112.02454">arXiv:2112.02454</a> <span> [<a href="https://arxiv.org/pdf/2112.02454">pdf</a>, <a href="https://arxiv.org/format/2112.02454">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41586-022-04746-6">10.1038/s41586-022-04746-6 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Axial Higgs Mode Detected by Quantum Pathway Interference in RTe3 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Y">Yiping Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Petrides%2C+I">Ioannis Petrides</a>, <a href="/search/cond-mat?searchtype=author&query=McNamara%2C+G">Grant McNamara</a>, <a href="/search/cond-mat?searchtype=author&query=Hosen%2C+M+M">Md Mofazzel Hosen</a>, <a href="/search/cond-mat?searchtype=author&query=Lei%2C+S">Shiming Lei</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+Y">Yueh-Chun Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Hart%2C+J+L">James L. Hart</a>, <a href="/search/cond-mat?searchtype=author&query=Lv%2C+H">Hongyan Lv</a>, <a href="/search/cond-mat?searchtype=author&query=Yan%2C+J">Jun Yan</a>, <a href="/search/cond-mat?searchtype=author&query=Xiao%2C+D">Di Xiao</a>, <a href="/search/cond-mat?searchtype=author&query=Cha%2C+J+J">Judy J. Cha</a>, <a href="/search/cond-mat?searchtype=author&query=Narang%2C+P">Prineha Narang</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Burch%2C+K+S">Kenneth S. Burch</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2112.02454v1-abstract-short" style="display: inline;"> The observation of the Higgs boson solidified the standard model of particle physics. However, explanations of anomalies (e.g. dark matter) rely on further symmetry breaking calling for an undiscovered axial Higgs mode. In condensed matter the Higgs was seen in magnetic, superconducting and charge density wave(CDW) systems. Uncovering a low energy mode's vector properties is challenging, requiring… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.02454v1-abstract-full').style.display = 'inline'; document.getElementById('2112.02454v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2112.02454v1-abstract-full" style="display: none;"> The observation of the Higgs boson solidified the standard model of particle physics. However, explanations of anomalies (e.g. dark matter) rely on further symmetry breaking calling for an undiscovered axial Higgs mode. In condensed matter the Higgs was seen in magnetic, superconducting and charge density wave(CDW) systems. Uncovering a low energy mode's vector properties is challenging, requiring going beyond typical spectroscopic or scattering techniques. Here, we discover an axial Higgs mode in the CDW system RTe3 using the interference of quantum pathways. In RTe3 (R=La,Gd), the electronic ordering couples bands of equal or different angular momenta. As such, the Raman scattering tensor associated to the Higgs mode contains both symmetric and antisymmetric components, which can be excited via two distinct, but degenerate pathways. This leads to constructive or destructive interference of these pathways, depending on the choice of the incident and Raman scattered light polarization. The qualitative behavior of the Raman spectra is well-captured by an appropriate tight-binding model including an axial Higgs mode. The elucidation of the antisymmetric component provides direct evidence that the Higgs mode contains an axial vector representation (i.e. a pseudo-angular momentum) and hints the CDW in RTe3 is unconventional. Thus we provide a means for measuring collective modes quantum properties without resorting to extreme experimental conditions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.02454v1-abstract-full').style.display = 'none'; document.getElementById('2112.02454v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 December, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2111.12079">arXiv:2111.12079</a> <span> [<a href="https://arxiv.org/pdf/2111.12079">pdf</a>, <a href="https://arxiv.org/format/2111.12079">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1002/adfm.202108920">10.1002/adfm.202108920 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> TaCo$_{2}$Te$_{2}$: An air-stable, magnetic van der Waals material with high mobility </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Singha%2C+R">Ratnadwip Singha</a>, <a href="/search/cond-mat?searchtype=author&query=Yuan%2C+F">Fang Yuan</a>, <a href="/search/cond-mat?searchtype=author&query=Cheng%2C+G">Guangming Cheng</a>, <a href="/search/cond-mat?searchtype=author&query=Salters%2C+T+H">Tyger H. Salters</a>, <a href="/search/cond-mat?searchtype=author&query=Oey%2C+Y+M">Yuzki M. Oey</a>, <a href="/search/cond-mat?searchtype=author&query=Villalpando%2C+G+V">Graciela V. Villalpando</a>, <a href="/search/cond-mat?searchtype=author&query=Jovanovic%2C+M">Milena Jovanovic</a>, <a href="/search/cond-mat?searchtype=author&query=Yao%2C+N">Nan Yao</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2111.12079v1-abstract-short" style="display: inline;"> Van der Waals (vdW) materials are an indispensable part of functional device technology due to their versatile physical properties and ease of exfoliating to the low-dimensional limit. Among all the compounds investigated so far, the search for magnetic vdW materials has intensified in recent years, fueled by the realization of magnetism in two dimensions (2D). However, metallic magnetic vdW syste… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.12079v1-abstract-full').style.display = 'inline'; document.getElementById('2111.12079v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2111.12079v1-abstract-full" style="display: none;"> Van der Waals (vdW) materials are an indispensable part of functional device technology due to their versatile physical properties and ease of exfoliating to the low-dimensional limit. Among all the compounds investigated so far, the search for magnetic vdW materials has intensified in recent years, fueled by the realization of magnetism in two dimensions (2D). However, metallic magnetic vdW systems are still uncommon. In addition, they rarely host high-mobility charge carriers, which is an essential requirement for high-speed electronic applications. Another shortcoming of 2D magnets is that they are highly air sensitive. Using chemical reasoning, we introduce TaCo2Te2 as an air-stable, high-mobility, magnetic vdW material. It has a layered structure, which consists of Peierls distorted Co chains and a large vdW gap between the layers. We find that the bulk crystals can be easily exfoliated and the obtained thin flakes are robust to ambient conditions after four months of monitoring using an optical microscope. We also observe signatures of canted antiferromagntic behavior at low-temperature. TaCo2Te2 shows a metallic character and a large, non-saturating, anisotropic magnetoresistance. Furthermore, our Hall data and quantum oscillation measurements reveal the presence of both electron- and hole-type carriers and their high mobility. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2111.12079v1-abstract-full').style.display = 'none'; document.getElementById('2111.12079v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 November, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, 8 figures; initial submitted version before peer review. A revised version is published in the journal</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Advanced Functional Materials 2108920 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2110.11125">arXiv:2110.11125</a> <span> [<a href="https://arxiv.org/pdf/2110.11125">pdf</a>, <a href="https://arxiv.org/format/2110.11125">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Real-space visualization of quasiparticle dephasing near the Planckian limit in the Dirac line node material ZrSiS </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=He%2C+Q">Qingyu He</a>, <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+L">Lihui Zhou</a>, <a href="/search/cond-mat?searchtype=author&query=Rost%2C+A+W">Andreas W. Rost</a>, <a href="/search/cond-mat?searchtype=author&query=Huang%2C+D">Dennis Huang</a>, <a href="/search/cond-mat?searchtype=author&query=Gr%C3%BCneis%2C+A">Andreas Gr眉neis</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Takagi%2C+H">Hidenori Takagi</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2110.11125v1-abstract-short" style="display: inline;"> Dirac line node (DLN) materials are topological semimetals wherein a set of symmetry protected crossing points forms a one-dimensional (1D) line in reciprocal space. Not only are the linearly dispersing bands expected to give rise to exceptional electronic properties, but the weak screening of the Coulomb interaction near the line node may enhance electronic correlations, produce new many-body gro… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.11125v1-abstract-full').style.display = 'inline'; document.getElementById('2110.11125v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2110.11125v1-abstract-full" style="display: none;"> Dirac line node (DLN) materials are topological semimetals wherein a set of symmetry protected crossing points forms a one-dimensional (1D) line in reciprocal space. Not only are the linearly dispersing bands expected to give rise to exceptional electronic properties, but the weak screening of the Coulomb interaction near the line node may enhance electronic correlations, produce new many-body ground states, or influence the quasiparticle lifetime. We investigate the quasiparticle dynamics in the DLN material ZrSiS via spectroscopic imaging scanning tunneling microscopy (SI-STM). By studying the spatial decay of quasiparticle interference patterns (QPI) from point scatterers, we were able to directly and selectively extract the phase coherence length $l_{\textrm{QPI}}$ and lifetime $蟿_{\textrm{QPI}}$ for the bulk DLN excitations, which are dominated by inelastic electron-electron scattering. We find that the experimental $蟿_{\textrm{QPI}}(E)$ values below $-$40 meV are very short, likely due to the stronger Coulomb interactions, and lie at the Planckian limit $\hbar/|E|$. Our results corroborate a growing body of experimental reports demonstrating unusual electronic correlation effects near a DLN. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.11125v1-abstract-full').style.display = 'none'; document.getElementById('2110.11125v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2109.14665">arXiv:2109.14665</a> <span> [<a href="https://arxiv.org/pdf/2109.14665">pdf</a>, <a href="https://arxiv.org/format/2109.14665">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1361-6463/ac6cb3">10.1088/1361-6463/ac6cb3 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Theoretical study of topological properties of ferromagnetic pyrite CoS$_2$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Robredo%2C+I">I帽igo Robredo</a>, <a href="/search/cond-mat?searchtype=author&query=Schr%C3%B6ter%2C+N+B+M">Niels B. M. Schr枚ter</a>, <a href="/search/cond-mat?searchtype=author&query=Reyes-Serrato%2C+A">Armando Reyes-Serrato</a>, <a href="/search/cond-mat?searchtype=author&query=Bergara%2C+A">Aitor Bergara</a>, <a href="/search/cond-mat?searchtype=author&query=de+Juan%2C+F">Fernando de Juan</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Vergniory%2C+M+G">Maia G. Vergniory</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2109.14665v2-abstract-short" style="display: inline;"> Since the discovery of the first topological material 15 years ago, the search for material realizations of novel topological phases has become the driving force of the field. While oftentimes we search for new materials, we forget that well established materials can also display very interesting topological properties. In this work, we revisit CoS$_2$ , a metallic ferromagnetic pyrite that has be… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.14665v2-abstract-full').style.display = 'inline'; document.getElementById('2109.14665v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2109.14665v2-abstract-full" style="display: none;"> Since the discovery of the first topological material 15 years ago, the search for material realizations of novel topological phases has become the driving force of the field. While oftentimes we search for new materials, we forget that well established materials can also display very interesting topological properties. In this work, we revisit CoS$_2$ , a metallic ferromagnetic pyrite that has been extensively studied in the literature due to its magnetic properties. We study the topological features of its electronic band structure and identify Weyl nodes and Nodal lines, as well as a symmetry-protected 4-fold fermion close to the Fermi level. Looking at different surface cleavage planes, we observe both spin polarized Fermi arcs in the majority channel and drumhead states. These findings suggest that CoS$_2$ is a promising platform to study topological phenomena, as well as a good candidate for spintronic applications. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.14665v2-abstract-full').style.display = 'none'; document.getElementById('2109.14665v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 September, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2109.04637">arXiv:2109.04637</a> <span> [<a href="https://arxiv.org/pdf/2109.04637">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41586-022-04514-6">10.1038/s41586-022-04514-6 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> One-Dimensional Luttinger Liquids in a Two-Dimensional Moir茅 Lattice </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wang%2C+P">Pengjie Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Yu%2C+G">Guo Yu</a>, <a href="/search/cond-mat?searchtype=author&query=Kwan%2C+Y+H">Yves H. Kwan</a>, <a href="/search/cond-mat?searchtype=author&query=Jia%2C+Y">Yanyu Jia</a>, <a href="/search/cond-mat?searchtype=author&query=Lei%2C+S">Shiming Lei</a>, <a href="/search/cond-mat?searchtype=author&query=Klemenz%2C+S">Sebastian Klemenz</a>, <a href="/search/cond-mat?searchtype=author&query=Cevallos%2C+F+A">F. Alexandre Cevallos</a>, <a href="/search/cond-mat?searchtype=author&query=Singha%2C+R">Ratnadwip Singha</a>, <a href="/search/cond-mat?searchtype=author&query=Devakul%2C+T">Trithep Devakul</a>, <a href="/search/cond-mat?searchtype=author&query=Watanabe%2C+K">Kenji Watanabe</a>, <a href="/search/cond-mat?searchtype=author&query=Taniguchi%2C+T">Takashi Taniguchi</a>, <a href="/search/cond-mat?searchtype=author&query=Sondhi%2C+S+L">Shivaji L. Sondhi</a>, <a href="/search/cond-mat?searchtype=author&query=Cava%2C+R+J">Robert J. Cava</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Parameswaran%2C+S+A">Siddharth A. Parameswaran</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+S">Sanfeng Wu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2109.04637v3-abstract-short" style="display: inline;"> The Luttinger liquid (LL) model of one-dimensional (1D) electronic systems provides a powerful tool for understanding strongly correlated physics including phenomena such as spin-charge separation. Substantial theoretical efforts have attempted to extend the LL phenomenology to two dimensions (2D), especially in models of closely packed arrays of 1D quantum wires, each being described as a LL. Suc… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.04637v3-abstract-full').style.display = 'inline'; document.getElementById('2109.04637v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2109.04637v3-abstract-full" style="display: none;"> The Luttinger liquid (LL) model of one-dimensional (1D) electronic systems provides a powerful tool for understanding strongly correlated physics including phenomena such as spin-charge separation. Substantial theoretical efforts have attempted to extend the LL phenomenology to two dimensions (2D), especially in models of closely packed arrays of 1D quantum wires, each being described as a LL. Such coupled-wire models have been successfully used to construct 2D anisotropic non-Fermi liquids, quantum Hall states, topological phases, and quantum spin liquids. However, an experimental demonstration of high-quality arrays of 1D LLs suitable for realizing these models remains absent. Here we report the experimental realization of 2D arrays of 1D LLs with crystalline quality in a moir茅 superlattice made of twisted bilayer tungsten ditelluride (tWTe$_{2}$). Originating from the anisotropic lattice of the monolayer, the moir茅 pattern of tWTe$_{2}$ hosts identical, parallel 1D electronic channels, separated by a fixed nanoscale distance, which is tunable by the interlayer twist angle. At a twist angle of ~ 5 degrees, we find that hole-doped tWTe$_{2}$ exhibits exceptionally large transport anisotropy with a resistance ratio of ~ 1000 between two orthogonal in-plane directions. The across-wire conductance exhibits power-law scaling behaviors, consistent with the formation of a 2D anisotropic phase that resembles an array of LLs. Our results open the door for realizing a variety of correlated and topological quantum phases based on coupled-wire models and LL physics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.04637v3-abstract-full').style.display = 'none'; document.getElementById('2109.04637v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 December, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 September, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">29 pages, 4 Main Figures + 13 Extended Data Figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature 605, 57-62 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2108.08006">arXiv:2108.08006</a> <span> [<a href="https://arxiv.org/pdf/2108.08006">pdf</a>, <a href="https://arxiv.org/format/2108.08006">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1021/acs.chemmater.1c00797">10.1021/acs.chemmater.1c00797 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Robust narrow-gap semiconducting behavior in square-net La$_{3}$Cd$_{2}$As$_{6}$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Piva%2C+M+M">Mario M. Piva</a>, <a href="/search/cond-mat?searchtype=author&query=Rahn%2C+M+C">Marein C. Rahn</a>, <a href="/search/cond-mat?searchtype=author&query=Thomas%2C+S+M">Sean M. Thomas</a>, <a href="/search/cond-mat?searchtype=author&query=Scott%2C+B+L">Brian L. Scott</a>, <a href="/search/cond-mat?searchtype=author&query=Pagliuso%2C+P+G">Pascoal G. Pagliuso</a>, <a href="/search/cond-mat?searchtype=author&query=Thompson%2C+J+D">Joe D. Thompson</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Ronning%2C+F">Filip Ronning</a>, <a href="/search/cond-mat?searchtype=author&query=Rosa%2C+P+F+S">Priscila F. S. Rosa</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2108.08006v1-abstract-short" style="display: inline;"> ABSTRACT: Narrow-gap semiconductors are sought-after materials due to their potential for long-wavelength detectors, thermoelectrics, and more recently non-trivial topology. Here we report the synthesis and characterization of a new family of narrow-gap semiconductors, $R$$_{3}$Cd$_{2}$As$_{6}$ ($R=$ La, Ce). Single crystal x-ray diffraction at room temperature reveals that the As square nets dist… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.08006v1-abstract-full').style.display = 'inline'; document.getElementById('2108.08006v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2108.08006v1-abstract-full" style="display: none;"> ABSTRACT: Narrow-gap semiconductors are sought-after materials due to their potential for long-wavelength detectors, thermoelectrics, and more recently non-trivial topology. Here we report the synthesis and characterization of a new family of narrow-gap semiconductors, $R$$_{3}$Cd$_{2}$As$_{6}$ ($R=$ La, Ce). Single crystal x-ray diffraction at room temperature reveals that the As square nets distort and Cd vacancies order in a monoclinic superstructure. A putative charge-density ordered state sets in at 279~K in La$_{3}$Cd$_{2}$As$_{6}$ and at 136~K in Ce$_{3}$Cd$_{2}$As$_{6}$ and is accompanied by a substantial increase in the electrical resistivity in both compounds. The resistivity of the La member increases by thirteen orders of magnitude on cooling, which points to a remarkably clean semiconducting ground state. Our results suggest that light square net materials within a $I4/mmm$ parent structure are promising clean narrow-gap semiconductors. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.08006v1-abstract-full').style.display = 'none'; document.getElementById('2108.08006v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 August, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Chem. Mater. 2021, 33, 11, 4122-4127 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2107.06883">arXiv:2107.06883</a> <span> [<a href="https://arxiv.org/pdf/2107.06883">pdf</a>, <a href="https://arxiv.org/format/2107.06883">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1002/adma.202103476">10.1002/adma.202103476 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Evolving Devil's staircase magnetization from tunable charge density waves in nonsymmorphic Dirac semimetals </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Singha%2C+R">Ratnadwip Singha</a>, <a href="/search/cond-mat?searchtype=author&query=Salters%2C+T+H">Tyger H. Salters</a>, <a href="/search/cond-mat?searchtype=author&query=Teicher%2C+S+M+L">Samuel M. L. Teicher</a>, <a href="/search/cond-mat?searchtype=author&query=Lei%2C+S">Shiming Lei</a>, <a href="/search/cond-mat?searchtype=author&query=Khoury%2C+J+F">Jason F. Khoury</a>, <a href="/search/cond-mat?searchtype=author&query=Ong%2C+N+P">N. Phuan Ong</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2107.06883v1-abstract-short" style="display: inline;"> While several magnetic topological semimetals have been discovered in recent years, their band structures are far from ideal, often obscured by trivial bands at the Fermi energy. Square-net materials with clean, linearly dispersing bands show potential to circumvent this issue. CeSbTe, a square-net material, features multiple magnetic field-controllable topological phases. Here, it is shown that i… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.06883v1-abstract-full').style.display = 'inline'; document.getElementById('2107.06883v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2107.06883v1-abstract-full" style="display: none;"> While several magnetic topological semimetals have been discovered in recent years, their band structures are far from ideal, often obscured by trivial bands at the Fermi energy. Square-net materials with clean, linearly dispersing bands show potential to circumvent this issue. CeSbTe, a square-net material, features multiple magnetic field-controllable topological phases. Here, it is shown that in this material, even higher degrees of tunability can be achieved by changing the electron count at the square-net motif. Increased electron filling results in structural distortion and formation of charge density waves (CDWs). The modulation wave-vector evolves continuously leading to a region of multiple discrete CDWs and a corresponding complex "Devil's staircase" magnetic ground state. A series of fractionally quantized magnetization plateaus are observed, which implies direct coupling between CDW and a collective spin-excitation. It is further shown that the CDW creates a robust idealized non-symmorphic Dirac semimetal, thus providing access to topological systems with rich magnetism. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.06883v1-abstract-full').style.display = 'none'; document.getElementById('2107.06883v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 July, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">17 pages, 15 figures, Revised version to appear in Advanced Materials</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Advanced Materials 33, 2103476 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2106.05287">arXiv:2106.05287</a> <span> [<a href="https://arxiv.org/pdf/2106.05287">pdf</a>, <a href="https://arxiv.org/format/2106.05287">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41586-022-04519-1">10.1038/s41586-022-04519-1 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Catalogue of Flat-Band Stoichiometric Materials </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Regnault%2C+N">Nicolas Regnault</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+Y">Yuanfeng Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+M">Ming-Rui Li</a>, <a href="/search/cond-mat?searchtype=author&query=Ma%2C+D">Da-Shuai Ma</a>, <a href="/search/cond-mat?searchtype=author&query=Jovanovic%2C+M">Milena Jovanovic</a>, <a href="/search/cond-mat?searchtype=author&query=Yazdani%2C+A">Ali Yazdani</a>, <a href="/search/cond-mat?searchtype=author&query=Parkin%2C+S+S+P">Stuart S. P. Parkin</a>, <a href="/search/cond-mat?searchtype=author&query=Felser%2C+C">Claudia Felser</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Ong%2C+N+P">N. Phuan Ong</a>, <a href="/search/cond-mat?searchtype=author&query=Cava%2C+R+J">Robert J. Cava</a>, <a href="/search/cond-mat?searchtype=author&query=Elcoro%2C+L">Luis Elcoro</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+Z">Zhi-Da Song</a>, <a href="/search/cond-mat?searchtype=author&query=Bernevig%2C+B+A">B. Andrei Bernevig</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2106.05287v3-abstract-short" style="display: inline;"> Topological electronic flatten bands near or at the Fermi level are a promising avenue towards unconventional superconductivity and correlated insulating states. However, the related experiments are mostly limited to the engineered materials, such as moire systems. Here we present a catalogue of all the three-dimensional stoichiometric materials with flat bands around the Fermi level that exist in… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.05287v3-abstract-full').style.display = 'inline'; document.getElementById('2106.05287v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2106.05287v3-abstract-full" style="display: none;"> Topological electronic flatten bands near or at the Fermi level are a promising avenue towards unconventional superconductivity and correlated insulating states. However, the related experiments are mostly limited to the engineered materials, such as moire systems. Here we present a catalogue of all the three-dimensional stoichiometric materials with flat bands around the Fermi level that exist in nature. We consider 55,206 materials from the Inorganic Crystal Structure Database catalogued using the Topological Quantum Chemistry website which provides their structural parameters, space group (SG), band structure, density of states and topological characterization. We combine several direct signatures and properties of band flatness to a high-throughput analysis of all crystal structures. In particular, we identify materials hosting line-graph or bipartite sublattices - either in two or three dimensions - likely leading to flat bands. From this trove of information, we create the Materials Flatband Database website, a powerful search engine for future theoretical and experimental studies. We use it to extract a curated list of 2,379 materials, with among them 345 promising candidates, potentially hosting flat bands whose charge centers are not strongly localized on the atomic sites. We showcase five representative materials: KAg[CN]2 in SG 163 $(P\bar{3}1c)$, Pb2Sb2O7 in SG 227 $(Fd\bar{3}m)$, Rb2CaH4 in SG 139 $(I4/mmm)$, Ca2NCl in SG 166 $(R\bar{3}m)$ and WO3 in SG 221 $(Pm\bar{3}m)$. We provide a theoretical explanation for the origin of their flat bands close to the Fermi energy using the $S$-matrix method introduced in a parallel work [Calugaru et al., Nature Physics 18, 185 (2022)]. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.05287v3-abstract-full').style.display = 'none'; document.getElementById('2106.05287v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 June, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 June, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16+162 pages, 21 tables, 71 figures, published version. This updated version contains an additional appendix providing ferromagnetic calculations for four flat-band materials. Acknowledgements have been fixed</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature 603, 824-828 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2011.12952">arXiv:2011.12952</a> <span> [<a href="https://arxiv.org/pdf/2011.12952">pdf</a>, <a href="https://arxiv.org/format/2011.12952">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.103.134418">10.1103/PhysRevB.103.134418 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Complex magnetic phases enriched by charge density waves in topological semimetals GdSb_xTe_{2-x-未} </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lei%2C+S">Shiming Lei</a>, <a href="/search/cond-mat?searchtype=author&query=Saltzman%2C+A">Audrey Saltzman</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2011.12952v1-abstract-short" style="display: inline;"> The interplay of crystal symmetry, magnetism, band topology and electronic correlation can be the origin of quantum phase transitions in condensed matter. Particularly, square-lattice materials have been serving as a versatile platform to study the rich phenomena resulting from that interplay. In this work, we report a detailed magnetic study on the square-lattice based magnetic topological semime… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.12952v1-abstract-full').style.display = 'inline'; document.getElementById('2011.12952v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2011.12952v1-abstract-full" style="display: none;"> The interplay of crystal symmetry, magnetism, band topology and electronic correlation can be the origin of quantum phase transitions in condensed matter. Particularly, square-lattice materials have been serving as a versatile platform to study the rich phenomena resulting from that interplay. In this work, we report a detailed magnetic study on the square-lattice based magnetic topological semimetals GdSb_{x}Te_{2-x-未}. We report the H-T magnetic phase diagrams along three crystallographic orientations and show that, for those materials where a charge density wave distortion is known to exist, many different magnetic phases are identified. In addition, the data provides a clue to the existence of an antiferromagnetic skyrmion phase, which has been theoretically predicted but not experimentally confirmed in a bulk material yet. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.12952v1-abstract-full').style.display = 'none'; document.getElementById('2011.12952v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 November, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 103, 134418 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2011.04646">arXiv:2011.04646</a> <span> [<a href="https://arxiv.org/pdf/2011.04646">pdf</a>, <a href="https://arxiv.org/format/2011.04646">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.103.205138">10.1103/PhysRevB.103.205138 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Signature of an Ultrafast Photo-Induced Lifshitz Transition in the Nodal-Line Semimetal ZrSiTe </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kirby%2C+R+J">Robert J. Kirby</a>, <a href="/search/cond-mat?searchtype=author&query=Muechler%2C+L">Lukas Muechler</a>, <a href="/search/cond-mat?searchtype=author&query=Klemenz%2C+S">Sebastian Klemenz</a>, <a href="/search/cond-mat?searchtype=author&query=Weinberg%2C+C">Caroline Weinberg</a>, <a href="/search/cond-mat?searchtype=author&query=Ferrenti%2C+A">Austin Ferrenti</a>, <a href="/search/cond-mat?searchtype=author&query=Oudah%2C+M">Mohamed Oudah</a>, <a href="/search/cond-mat?searchtype=author&query=Fausti%2C+D">Daniele Fausti</a>, <a href="/search/cond-mat?searchtype=author&query=Scholes%2C+G+D">Gregory D. Scholes</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2011.04646v1-abstract-short" style="display: inline;"> Here we report an ultrafast optical spectroscopic study of the nodal-line semimetal ZrSiTe. Our measurements reveal that, converse to other compounds of the family, the sudden injection of electronic excitations results in a strongly coherent response of an $A_{1g}$ phonon mode which dynamically modifies the distance between Zr and Te atoms and Si layers. "Frozen phonon" DFT calculations, in which… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.04646v1-abstract-full').style.display = 'inline'; document.getElementById('2011.04646v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2011.04646v1-abstract-full" style="display: none;"> Here we report an ultrafast optical spectroscopic study of the nodal-line semimetal ZrSiTe. Our measurements reveal that, converse to other compounds of the family, the sudden injection of electronic excitations results in a strongly coherent response of an $A_{1g}$ phonon mode which dynamically modifies the distance between Zr and Te atoms and Si layers. "Frozen phonon" DFT calculations, in which band structures are calculated as a function of nuclear position along the phonon mode coordinate, show that large displacements along this mode alter the material's electronic structure significantly, forcing bands to approach and even cross the Fermi energy. The incoherent part of the time domain response reveals that a delayed electronic response at low fluence discontinuously evolves into an instantaneous one for excitation densities larger than $3.43 \times 10^{17}$ cm$^{-3}$. This sudden change of the dissipative channels for electronic excitations is indicative of an ultrafast Lifshitz transition which we tentatively associate to a change in topology of the Fermi surface driven by a symmetry preserving $A_{1g}$ phonon mode. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.04646v1-abstract-full').style.display = 'none'; document.getElementById('2011.04646v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 November, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 103, 205138 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2010.05390">arXiv:2010.05390</a> <span> [<a href="https://arxiv.org/pdf/2010.05390">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41567-021-01422-w">10.1038/s41567-021-01422-w <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Evidence for a Monolayer Excitonic Insulator </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Jia%2C+Y">Yanyu Jia</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+P">Pengjie Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Chiu%2C+C">Cheng-Li Chiu</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+Z">Zhida Song</a>, <a href="/search/cond-mat?searchtype=author&query=Yu%2C+G">Guo Yu</a>, <a href="/search/cond-mat?searchtype=author&query=J%C3%A4ck%2C+B">Berthold J盲ck</a>, <a href="/search/cond-mat?searchtype=author&query=Lei%2C+S">Shiming Lei</a>, <a href="/search/cond-mat?searchtype=author&query=Klemenz%2C+S">Sebastian Klemenz</a>, <a href="/search/cond-mat?searchtype=author&query=Cevallos%2C+F+A">F. Alexandre Cevallos</a>, <a href="/search/cond-mat?searchtype=author&query=Onyszczak%2C+M">Michael Onyszczak</a>, <a href="/search/cond-mat?searchtype=author&query=Fishchenko%2C+N">Nadezhda Fishchenko</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+X">Xiaomeng Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Farahi%2C+G">Gelareh Farahi</a>, <a href="/search/cond-mat?searchtype=author&query=Xie%2C+F">Fang Xie</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+Y">Yuanfeng Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Watanabe%2C+K">Kenji Watanabe</a>, <a href="/search/cond-mat?searchtype=author&query=Taniguchi%2C+T">Takashi Taniguchi</a>, <a href="/search/cond-mat?searchtype=author&query=Bernevig%2C+B+A">B. Andrei Bernevig</a>, <a href="/search/cond-mat?searchtype=author&query=Cava%2C+R+J">Robert J. Cava</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Yazdani%2C+A">Ali Yazdani</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+S">Sanfeng Wu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2010.05390v3-abstract-short" style="display: inline;"> The interplay between topology and correlations can generate a variety of quantum phases, many of which remain to be explored. Recent advances have identified monolayer WTe2 as a promising material for doing so in a highly tunable fashion. The ground state of this two-dimensional (2D) crystal can be electrostatically tuned from a quantum spin Hall insulator (QSHI) to a superconductor. However, muc… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2010.05390v3-abstract-full').style.display = 'inline'; document.getElementById('2010.05390v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2010.05390v3-abstract-full" style="display: none;"> The interplay between topology and correlations can generate a variety of quantum phases, many of which remain to be explored. Recent advances have identified monolayer WTe2 as a promising material for doing so in a highly tunable fashion. The ground state of this two-dimensional (2D) crystal can be electrostatically tuned from a quantum spin Hall insulator (QSHI) to a superconductor. However, much remains unknown about the gap-opening mechanism of the insulating state. Here we report evidence that the QSHI is also an excitonic insulator (EI), arising from the spontaneous formation of electron-hole bound states (excitons). We reveal the presence of an intrinsic insulating state at the charge neutrality point (CNP) in clean samples and confirm the correlated nature of this charge-neutral insulator by tunneling spectroscopy. We provide evidence against alternative scenarios of a band insulator or a localized insulator and support the existence of an EI phase in the clean limit. These observations lay the foundation for understanding a new class of correlated insulators with nontrivial topology and identify monolayer WTe2 as a promising candidate for exploring quantum phases of ground-state excitons. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2010.05390v3-abstract-full').style.display = 'none'; document.getElementById('2010.05390v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 October, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">39 pages; Nat. Phys. (2021)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2010.05383">arXiv:2010.05383</a> <span> [<a href="https://arxiv.org/pdf/2010.05383">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41586-020-03084-9">10.1038/s41586-020-03084-9 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Landau Quantization and Highly Mobile Fermions in an Insulator </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wang%2C+P">Pengjie Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Yu%2C+G">Guo Yu</a>, <a href="/search/cond-mat?searchtype=author&query=Jia%2C+Y">Yanyu Jia</a>, <a href="/search/cond-mat?searchtype=author&query=Onyszczak%2C+M">Michael Onyszczak</a>, <a href="/search/cond-mat?searchtype=author&query=Cevallos%2C+F+A">F. Alexandre Cevallos</a>, <a href="/search/cond-mat?searchtype=author&query=Lei%2C+S">Shiming Lei</a>, <a href="/search/cond-mat?searchtype=author&query=Klemenz%2C+S">Sebastian Klemenz</a>, <a href="/search/cond-mat?searchtype=author&query=Watanabe%2C+K">Kenji Watanabe</a>, <a href="/search/cond-mat?searchtype=author&query=Taniguchi%2C+T">Takashi Taniguchi</a>, <a href="/search/cond-mat?searchtype=author&query=Cava%2C+R+J">Robert J. Cava</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+S">Sanfeng Wu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2010.05383v2-abstract-short" style="display: inline;"> In strongly correlated materials, quasiparticle excitations can carry fractional quantum numbers. An intriguing possibility is the formation of fractionalized, charge-neutral fermions, e.g., spinons and fermionic excitons, that result in neutral Fermi surfaces and Landau quantization in an insulator. While previous experiments in quantum spin liquids, topological Kondo insulators, and quantum Hall… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2010.05383v2-abstract-full').style.display = 'inline'; document.getElementById('2010.05383v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2010.05383v2-abstract-full" style="display: none;"> In strongly correlated materials, quasiparticle excitations can carry fractional quantum numbers. An intriguing possibility is the formation of fractionalized, charge-neutral fermions, e.g., spinons and fermionic excitons, that result in neutral Fermi surfaces and Landau quantization in an insulator. While previous experiments in quantum spin liquids, topological Kondo insulators, and quantum Hall systems have hinted at charge-neutral Fermi surfaces, evidence for their existence remains far from conclusive. Here we report experimental observation of Landau quantization in a two dimensional (2D) insulator, i.e., monolayer tungsten ditelluride (WTe$_{2}$), a large gap topological insulator. Using a detection scheme that avoids edge contributions, we uncover strikingly large quantum oscillations in the monolayer insulator's magnetoresistance, with an onset field as small as ~ 0.5 tesla. Despite the huge resistance, the oscillation profile, which exhibits many periods, mimics the Shubnikov-de Haas oscillations in metals. Remarkably, at ultralow temperatures the observed oscillations evolve into discrete peaks near 1.6 tesla, above which the Landau quantized regime is fully developed. Such a low onset field of quantization is comparable to high-mobility conventional two-dimensional electron gases. Our experiments call for further investigation of the highly unusual ground state of the WTe$_{2}$ monolayer. This includes the influence of device components and the possible existence of mobile fermions and charge-neutral Fermi surfaces inside its insulating gap. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2010.05383v2-abstract-full').style.display = 'none'; document.getElementById('2010.05383v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 January, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 October, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">33 pages, 4 Main Figures + 10 Extended Data Figures + 1 SI Figure</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature 589, 225-229 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2010.00070">arXiv:2010.00070</a> <span> [<a href="https://arxiv.org/pdf/2010.00070">pdf</a>, <a href="https://arxiv.org/format/2010.00070">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.105.L121111">10.1103/PhysRevB.105.L121111 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quasiparticle interference observation of the topologically non-trivial drumhead surface state in ZrSiTe </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Stuart%2C+B+A">B. A. Stuart</a>, <a href="/search/cond-mat?searchtype=author&query=Choi%2C+S">Seokhwan Choi</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+J">Jisun Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Muechler%2C+L">Lukas Muechler</a>, <a href="/search/cond-mat?searchtype=author&query=Queiroz%2C+R">Raquel Queiroz</a>, <a href="/search/cond-mat?searchtype=author&query=Oudah%2C+M">Mohamed Oudah</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">L. M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Bonn%2C+D+A">D. A. Bonn</a>, <a href="/search/cond-mat?searchtype=author&query=Burke%2C+S+A">S. A. Burke</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2010.00070v2-abstract-short" style="display: inline;"> Drumhead surface states that link together loops of nodal lines arise in Dirac nodal-line semimetals as a consequence of the topologically non-trivial band crossings. We used low-temperature scanning tunneling microscopy and Fourier-transformed scanning tunneling spectroscopy to investigate the quasiparticle interference (QPI) properties of ZrSiTe. Our results show two scattering signals across th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2010.00070v2-abstract-full').style.display = 'inline'; document.getElementById('2010.00070v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2010.00070v2-abstract-full" style="display: none;"> Drumhead surface states that link together loops of nodal lines arise in Dirac nodal-line semimetals as a consequence of the topologically non-trivial band crossings. We used low-temperature scanning tunneling microscopy and Fourier-transformed scanning tunneling spectroscopy to investigate the quasiparticle interference (QPI) properties of ZrSiTe. Our results show two scattering signals across the drumhead state resolving the energy-momentum relationship through the occupied and unoccupied energy ranges it is predicted to span. Observation of this drumhead state is in contrast to previous studies on ZrSiS and ZrSiSe, where the QPI was dominated by topologically trivial bulk bands and surface states. Furthermore, we observe a near $\mathbf{k} \rightarrow -\mathbf{k}$ scattering process across the $螕$-point, enabled by scattering between the spin-split drumhead bands in this material. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2010.00070v2-abstract-full').style.display = 'none'; document.getElementById('2010.00070v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 February, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 September, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 3 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2009.00620">arXiv:2009.00620</a> <span> [<a href="https://arxiv.org/pdf/2009.00620">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1002/adma.202101591">10.1002/adma.202101591 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Band Engineering of Dirac Semimetals using Charge Density Waves </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lei%2C+S">Shiming Lei</a>, <a href="/search/cond-mat?searchtype=author&query=Teicher%2C+S+M+L">Samuel M. L. Teicher</a>, <a href="/search/cond-mat?searchtype=author&query=Topp%2C+A">Andreas Topp</a>, <a href="/search/cond-mat?searchtype=author&query=Cai%2C+K">Kehan Cai</a>, <a href="/search/cond-mat?searchtype=author&query=Lin%2C+J">Jingjing Lin</a>, <a href="/search/cond-mat?searchtype=author&query=Rodolakis%2C+F">Fanny Rodolakis</a>, <a href="/search/cond-mat?searchtype=author&query=McChesney%2C+J+L">Jessica L. McChesney</a>, <a href="/search/cond-mat?searchtype=author&query=Krivenkov%2C+M">Maxim Krivenkov</a>, <a href="/search/cond-mat?searchtype=author&query=Marchenko%2C+D">Dmitry Marchenko</a>, <a href="/search/cond-mat?searchtype=author&query=Varykhalov%2C+A">Andrei Varykhalov</a>, <a href="/search/cond-mat?searchtype=author&query=Ast%2C+C+R">Christian R. Ast</a>, <a href="/search/cond-mat?searchtype=author&query=Car%2C+R">Roberto Car</a>, <a href="/search/cond-mat?searchtype=author&query=Cano%2C+J">Jennifer Cano</a>, <a href="/search/cond-mat?searchtype=author&query=Vergniory%2C+M+G">Maia G. Vergniory</a>, <a href="/search/cond-mat?searchtype=author&query=Ong%2C+N+P">N. Phuan Ong</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2009.00620v3-abstract-short" style="display: inline;"> New developments in the field of topological matter are often driven by materials discovery, including novel topological insulators, Dirac semimetals and Weyl semimetals. In the last few years, large efforts have been performed to classify all known inorganic materials with respect to their topology. Unfortunately, a large number of topological materials suffer from non-ideal band structures. For… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.00620v3-abstract-full').style.display = 'inline'; document.getElementById('2009.00620v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2009.00620v3-abstract-full" style="display: none;"> New developments in the field of topological matter are often driven by materials discovery, including novel topological insulators, Dirac semimetals and Weyl semimetals. In the last few years, large efforts have been performed to classify all known inorganic materials with respect to their topology. Unfortunately, a large number of topological materials suffer from non-ideal band structures. For example, topological bands are frequently convoluted with trivial ones, and band structure features of interest can appear far below the Fermi level. This leaves just a handful of materials that are intensively studied. Finding strategies to design new topological materials is a solution. Here we introduce a new mechanism that is based on charge density waves and non-symmorphic symmetry to design an idealized Dirac semimetal. We then show experimentally that the antiferromagnetic compound GdSb$_{0.46}$Te$_{1.48}$ is a nearly ideal Dirac semimetal based on the proposed mechanism, meaning that most interfering bands at the Fermi level are suppressed. Its highly unusual transport behavior points to a thus far unknown regime, in which Dirac carriers with Fermi energy very close to the node seem to gradually localize in the presence of lattice and magnetic disorder. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.00620v3-abstract-full').style.display = 'none'; document.getElementById('2009.00620v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 June, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 September, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2020. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2007.13784">arXiv:2007.13784</a> <span> [<a href="https://arxiv.org/pdf/2007.13784">pdf</a>, <a href="https://arxiv.org/ps/2007.13784">ps</a>, <a href="https://arxiv.org/format/2007.13784">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Other Condensed Matter">cond-mat.other</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/5.0006462">10.1063/5.0006462 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A Cleanroom in a Glovebox </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Gray%2C+M+J">Mason J. Gray</a>, <a href="/search/cond-mat?searchtype=author&query=Kumar%2C+N">Narendra Kumar</a>, <a href="/search/cond-mat?searchtype=author&query=O%27Connor%2C+R">Ryan O'Connor</a>, <a href="/search/cond-mat?searchtype=author&query=Hoek%2C+M">Marcel Hoek</a>, <a href="/search/cond-mat?searchtype=author&query=Sheridan%2C+E">Erin Sheridan</a>, <a href="/search/cond-mat?searchtype=author&query=Doyle%2C+M+C">Meaghan C. Doyle</a>, <a href="/search/cond-mat?searchtype=author&query=Romanelli%2C+M+L">Marisa L. Romanelli</a>, <a href="/search/cond-mat?searchtype=author&query=Osterhoudt%2C+G+B">Gavin B. Osterhoudt</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Y">Yiping Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Plisson%2C+V">Vincent Plisson</a>, <a href="/search/cond-mat?searchtype=author&query=Lei%2C+S">Shiming Lei</a>, <a href="/search/cond-mat?searchtype=author&query=Zhong%2C+R">Ruidan Zhong</a>, <a href="/search/cond-mat?searchtype=author&query=Rachmilowitz%2C+B">Bryan Rachmilowitz</a>, <a href="/search/cond-mat?searchtype=author&query=Zhao%2C+H">He Zhao</a>, <a href="/search/cond-mat?searchtype=author&query=Kitadai%2C+H">Hikari Kitadai</a>, <a href="/search/cond-mat?searchtype=author&query=Shepard%2C+S">Steven Shepard</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Gu%2C+G+D">G. D. Gu</a>, <a href="/search/cond-mat?searchtype=author&query=Zeljkovic%2C+I">Ilija Zeljkovic</a>, <a href="/search/cond-mat?searchtype=author&query=Ling%2C+X">Xi Ling</a>, <a href="/search/cond-mat?searchtype=author&query=Burch%2C+K+S">K. S. Burch</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2007.13784v1-abstract-short" style="display: inline;"> The exploration of new materials, novel quantum phases, and devices requires ways to prepare cleaner samples with smaller feature sizes. Initially, this meant the use of a cleanroom that limits the amount and size of dust particles. However, many materials are highly sensitive to oxygen and water in the air. Furthermore, the ever-increasing demand for a quantum workforce, trained and able to use t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.13784v1-abstract-full').style.display = 'inline'; document.getElementById('2007.13784v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2007.13784v1-abstract-full" style="display: none;"> The exploration of new materials, novel quantum phases, and devices requires ways to prepare cleaner samples with smaller feature sizes. Initially, this meant the use of a cleanroom that limits the amount and size of dust particles. However, many materials are highly sensitive to oxygen and water in the air. Furthermore, the ever-increasing demand for a quantum workforce, trained and able to use the equipment for creating and characterizing materials, calls for a dramatic reduction in the cost to create and operate such facilities. To this end, we present our cleanroom-in-a-glovebox, a system which allows for the fabrication and characterization of devices in an inert argon atmosphere. We demonstrate the ability to perform a wide range of characterization as well as fabrication steps, without the need for a dedicated room, all in an argon environment. Connection to a vacuum suitcase is also demonstrated to enable receiving from and transfer to various ultra-high vacuum (UHV) equipment including molecular-beam epitaxy (MBE) and scanning tunneling microscopy (STM). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.13784v1-abstract-full').style.display = 'none'; document.getElementById('2007.13784v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 July, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Review of Scientific Instruments 91, 073909 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2006.01557">arXiv:2006.01557</a> <span> [<a href="https://arxiv.org/pdf/2006.01557">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Weyl-fermions, Fermi-arcs, and minority-spin carriers in ferromagnetic CoS2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Schr%C3%B6ter%2C+N+B+M">Niels B. M. Schr枚ter</a>, <a href="/search/cond-mat?searchtype=author&query=Robredo%2C+I">I帽igo Robredo</a>, <a href="/search/cond-mat?searchtype=author&query=Klemenz%2C+S">Sebastian Klemenz</a>, <a href="/search/cond-mat?searchtype=author&query=Kirby%2C+R+J">Robert J. Kirby</a>, <a href="/search/cond-mat?searchtype=author&query=Krieger%2C+J+A">Jonas A. Krieger</a>, <a href="/search/cond-mat?searchtype=author&query=Pei%2C+D">Ding Pei</a>, <a href="/search/cond-mat?searchtype=author&query=Yu%2C+T">Tianlun Yu</a>, <a href="/search/cond-mat?searchtype=author&query=Stolz%2C+S">Samuel Stolz</a>, <a href="/search/cond-mat?searchtype=author&query=Schmitt%2C+T">Thorsten Schmitt</a>, <a href="/search/cond-mat?searchtype=author&query=Dudin%2C+P">Pavel Dudin</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+T+K">Timur K. Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Cacho%2C+C">Cephise Cacho</a>, <a href="/search/cond-mat?searchtype=author&query=Schnyder%2C+A">Andreas Schnyder</a>, <a href="/search/cond-mat?searchtype=author&query=Bergara%2C+A">Aitor Bergara</a>, <a href="/search/cond-mat?searchtype=author&query=Strocov%2C+V+N">Vladimir N. Strocov</a>, <a href="/search/cond-mat?searchtype=author&query=de+Juan%2C+F">Fernando de Juan</a>, <a href="/search/cond-mat?searchtype=author&query=Vergniory%2C+M+G">Maia G. Vergniory</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2006.01557v1-abstract-short" style="display: inline;"> The pyrite compound CoS2 has been intensively studied in the past due to its itinerant ferromagnetism and potential for half-metallicity, which make it a promising material for spintronic applications. However, its electronic structure remains only poorly understood. Here we use complementary bulk- and surface-sensitive angle-resolved photoelectron spectroscopy and ab-initio calculations to provid… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.01557v1-abstract-full').style.display = 'inline'; document.getElementById('2006.01557v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2006.01557v1-abstract-full" style="display: none;"> The pyrite compound CoS2 has been intensively studied in the past due to its itinerant ferromagnetism and potential for half-metallicity, which make it a promising material for spintronic applications. However, its electronic structure remains only poorly understood. Here we use complementary bulk- and surface-sensitive angle-resolved photoelectron spectroscopy and ab-initio calculations to provide a complete picture of its band structure. We discover Weyl-cones at the Fermi-level, which presents CoS2 in a new light as a rare member of the recently discovered class of magnetic topological metals. We directly observe the topological Fermi-arc surface states that link the Weyl-nodes, which will influence the performance of CoS2 as a spin-injector by modifying its spin-polarization at interfaces. Additionally, we are for the first time able to directly observe a minority-spin bulk electron pocket in the corner of the Brillouin zone, which proves that CoS2 cannot be a true half-metal. Beyond settling the longstanding debate about half-metallicity in CoS2, our results provide a prime example of how the topology of magnetic materials can affect their use in spintronic applications. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.01557v1-abstract-full').style.display = 'none'; document.getElementById('2006.01557v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2020. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2005.04248">arXiv:2005.04248</a> <span> [<a href="https://arxiv.org/pdf/2005.04248">pdf</a>, <a href="https://arxiv.org/format/2005.04248">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> </div> <p class="title is-5 mathjax"> Transient Drude Response Dominates Near-Infrared Pump-Probe Reflectivity in Nodal-Line Semimetals ZrSiS and ZrSiSe </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kirby%2C+R+J">Robert J. Kirby</a>, <a href="/search/cond-mat?searchtype=author&query=Ferrenti%2C+A">Austin Ferrenti</a>, <a href="/search/cond-mat?searchtype=author&query=Weinberg%2C+C">Caroline Weinberg</a>, <a href="/search/cond-mat?searchtype=author&query=Klemenz%2C+S">Sebastian Klemenz</a>, <a href="/search/cond-mat?searchtype=author&query=Oudah%2C+M">Mohamed Oudah</a>, <a href="/search/cond-mat?searchtype=author&query=Weber%2C+C+P">Chris P. Weber</a>, <a href="/search/cond-mat?searchtype=author&query=Fausti%2C+D">Daniele Fausti</a>, <a href="/search/cond-mat?searchtype=author&query=Scholes%2C+G+D">Gregory D. Scholes</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2005.04248v1-abstract-short" style="display: inline;"> The ultrafast optical response of two nodal-line semimetals, ZrSiS and ZrSiSe, was studied in the near-infrared using transient reflectivity. The two materials exhibit similar responses, characterized by two features, well resolved in time and energy. The first transient feature decays after a few hundred femtoseconds, while the second lasts for nanoseconds. Using Drude-Lorentz fits of the materia… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.04248v1-abstract-full').style.display = 'inline'; document.getElementById('2005.04248v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2005.04248v1-abstract-full" style="display: none;"> The ultrafast optical response of two nodal-line semimetals, ZrSiS and ZrSiSe, was studied in the near-infrared using transient reflectivity. The two materials exhibit similar responses, characterized by two features, well resolved in time and energy. The first transient feature decays after a few hundred femtoseconds, while the second lasts for nanoseconds. Using Drude-Lorentz fits of the materials' equilibrium reflectance, we show that the fast response is well-represented by a decrease of the Drude plasma frequency, and the second feature by an increase of the Drude scattering rate. This directly connects the transient data to a physical picture in which carriers, after being excited away from the Fermi energy, return to that vicinity within a few hundred femtoseconds by sharing their excess energy with the phonon bath, resulting in a hot lattice that relaxes only through slow diffusion processes (ns). The emerging picture reveals that the sudden change of the density of carriers at the Fermi level instantaneously modifies the transport properties of the materials on a timescale not compatible with electron phonon thermalization and is largely driven by the reduced density of states at the nodal line. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.04248v1-abstract-full').style.display = 'none'; document.getElementById('2005.04248v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2020. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2002.04611">arXiv:2002.04611</a> <span> [<a href="https://arxiv.org/pdf/2002.04611">pdf</a>, <a href="https://arxiv.org/format/2002.04611">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1021/jacs.0c01227">10.1021/jacs.0c01227 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The role of delocalized chemical bonding in square-net-based topological semimetals </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Klemenz%2C+S">Sebastian Klemenz</a>, <a href="/search/cond-mat?searchtype=author&query=Hay%2C+A+K">Aurland K. Hay</a>, <a href="/search/cond-mat?searchtype=author&query=Teicher%2C+S+M+L">Samuel M. L. Teicher</a>, <a href="/search/cond-mat?searchtype=author&query=Topp%2C+A">Andreas Topp</a>, <a href="/search/cond-mat?searchtype=author&query=Cano%2C+J">Jennifer Cano</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2002.04611v1-abstract-short" style="display: inline;"> Principles that predict reactions or properties of materials define the discipline of chemistry. In this work we derive chemical rules, based on atomic distances and chemical bond character, which predict topological materials in compounds that feature the structural motif of a square-net. Using these rules we identify over 300 potential new topological materials. We show that simple chemical heur… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.04611v1-abstract-full').style.display = 'inline'; document.getElementById('2002.04611v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2002.04611v1-abstract-full" style="display: none;"> Principles that predict reactions or properties of materials define the discipline of chemistry. In this work we derive chemical rules, based on atomic distances and chemical bond character, which predict topological materials in compounds that feature the structural motif of a square-net. Using these rules we identify over 300 potential new topological materials. We show that simple chemical heuristics can be a powerful tool to characterize topological matter. In contrast to previous database-driven materials categorization our approach allows us to identify candidates that are alloys, solid-solutions, or compounds with statistical vacancies. While previous material searches relied on density functional theory, our approach is not limited by this method and could also be used to discover magnetic and statistically-disordered topological semimetals. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.04611v1-abstract-full').style.display = 'none'; document.getElementById('2002.04611v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 February, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">30 pages, 8 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Am. Chem. Soc. 2020, 142, 13, 6350-6359 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2002.04379">arXiv:2002.04379</a> <span> [<a href="https://arxiv.org/pdf/2002.04379">pdf</a>, <a href="https://arxiv.org/format/2002.04379">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevResearch.2.023217">10.1103/PhysRevResearch.2.023217 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Determination of the Fermi surface and field-induced quasi-particle tunneling around the Dirac nodal-loop in ZrSiS </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=M%C3%BCller%2C+C+S+A">C. S. A. M眉ller</a>, <a href="/search/cond-mat?searchtype=author&query=Khouri%2C+T">T. Khouri</a>, <a href="/search/cond-mat?searchtype=author&query=van+Delft%2C+M+R">M. R. van Delft</a>, <a href="/search/cond-mat?searchtype=author&query=Pezzini%2C+S">S. Pezzini</a>, <a href="/search/cond-mat?searchtype=author&query=Hsu%2C+Y+-">Y. -T. Hsu</a>, <a href="/search/cond-mat?searchtype=author&query=Ayres%2C+J">J. Ayres</a>, <a href="/search/cond-mat?searchtype=author&query=Breitkreiz%2C+M">M. Breitkreiz</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">L. M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Carrington%2C+A">A. Carrington</a>, <a href="/search/cond-mat?searchtype=author&query=Hussey%2C+N+E">N. E. Hussey</a>, <a href="/search/cond-mat?searchtype=author&query=Wiedmann%2C+S">S. Wiedmann</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2002.04379v1-abstract-short" style="display: inline;"> Unambiguous and complete determination of the Fermi surface is a primary step in understanding the electronic properties of topical metals and semi-metals, but only in a relatively few cases has this goal been realized. In this work, we present a systematic high-field quantum oscillation study up to 35 T on ZrSiS, a textbook example of a nodal-line semimetal with only linearly dispersive bands cro… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.04379v1-abstract-full').style.display = 'inline'; document.getElementById('2002.04379v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2002.04379v1-abstract-full" style="display: none;"> Unambiguous and complete determination of the Fermi surface is a primary step in understanding the electronic properties of topical metals and semi-metals, but only in a relatively few cases has this goal been realized. In this work, we present a systematic high-field quantum oscillation study up to 35 T on ZrSiS, a textbook example of a nodal-line semimetal with only linearly dispersive bands crossing the Fermi energy. The topology of the Fermi surface is determined with unprecedented precision and all pockets are identified by comparing the measured angle dependence of the quantum oscillations to density functional theory calculations. Comparison of the Shubnikov-de Haas and de Haas-van Alphen oscillations at low temperatures and analysis of the respective Dingle plots reveal the presence of significantly enhanced scattering on the electron pocket. Above a threshold field that is aligned along the c-axis of the crystal, the specific cage-like Fermi surface of ZrSiS allows for electron-hole tunneling to occur across finite gaps in momentum space leading to quantum oscillations with a complex frequency spectrum. Additional high-frequency quantum oscillations signify magnetic breakdown orbits that encircle the entire Dirac nodal loop. We suggest that the persistence of quantum oscillations in the resistivity to high temperatures is caused by Stark interference between orbits of nearly equal masses. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.04379v1-abstract-full').style.display = 'none'; document.getElementById('2002.04379v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 February, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">14 pages, 13 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Research 2, 023217 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1910.09852">arXiv:1910.09852</a> <span> [<a href="https://arxiv.org/pdf/1910.09852">pdf</a>, <a href="https://arxiv.org/format/1910.09852">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevMaterials.3.084203">10.1103/PhysRevMaterials.3.084203 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Origin of the butterfly magnetoresistance in ZrSiS </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Voerman%2C+J+A">J. A. Voerman</a>, <a href="/search/cond-mat?searchtype=author&query=Mulder%2C+L">L. Mulder</a>, <a href="/search/cond-mat?searchtype=author&query=de+Boer%2C+J+C">J. C. de Boer</a>, <a href="/search/cond-mat?searchtype=author&query=Huang%2C+Y">Y. Huang</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">L. M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+C">Chuan Li</a>, <a href="/search/cond-mat?searchtype=author&query=Brinkman%2C+A">A. Brinkman</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1910.09852v1-abstract-short" style="display: inline;"> ZrSiS has been identified as a topological material made from non-toxic and earth-abundant elements. Together with its extremely large and uniquely angle-dependent magnetoresistance this makes it an interesting material for applications. We study the origin of the so-called butterfly magnetoresistance by performing magnetotransport measurements on four different devices made from exfoliated crysta… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.09852v1-abstract-full').style.display = 'inline'; document.getElementById('1910.09852v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1910.09852v1-abstract-full" style="display: none;"> ZrSiS has been identified as a topological material made from non-toxic and earth-abundant elements. Together with its extremely large and uniquely angle-dependent magnetoresistance this makes it an interesting material for applications. We study the origin of the so-called butterfly magnetoresistance by performing magnetotransport measurements on four different devices made from exfoliated crystalline flakes. We identify near-perfect electron-hole compensation, tuned by the Zeeman effect, as the source of the butterfly magnetoresistance. Furthermore, the observed Shubnikov-de Haas oscillations are carefully analyzed using the Lifshitz-Kosevich equation to determine their Berry phase and thus their topological properties. Although the link between the butterfly magnetoresistance and the Berry phase remains uncertain, the topological nature of ZrSiS is confirmed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.09852v1-abstract-full').style.display = 'none'; document.getElementById('1910.09852v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 October, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Materials 3, 084203 (Published 23 August 2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1910.07571">arXiv:1910.07571</a> <span> [<a href="https://arxiv.org/pdf/1910.07571">pdf</a>, <a href="https://arxiv.org/ps/1910.07571">ps</a>, <a href="https://arxiv.org/format/1910.07571">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevResearch.1.032015">10.1103/PhysRevResearch.1.032015 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Magneto-optical probe of the fully gapped Dirac band in ZrSiS </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Uykur%2C+E">E. Uykur</a>, <a href="/search/cond-mat?searchtype=author&query=Maulana%2C+L+Z">L. Z. Maulana</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">L. M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Lotsch%2C+B+V">B. V. Lotsch</a>, <a href="/search/cond-mat?searchtype=author&query=Dressel%2C+M">M. Dressel</a>, <a href="/search/cond-mat?searchtype=author&query=Pronin%2C+A+V">A. V. Pronin</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1910.07571v1-abstract-short" style="display: inline;"> We present a far-infrared magneto-optical study of the gapped nodal-line semimetal ZrSiS in magnetic fields $B$ up to 7 T. The observed field-dependent features, which represent intra- (cyclotron resonance) and interband transitions, develop as $\sqrt{B}$ in increasing field and can be consistently explained within a simple 2D Dirac band model with a gap of 26 meV and an averaged Fermi velocity of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.07571v1-abstract-full').style.display = 'inline'; document.getElementById('1910.07571v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1910.07571v1-abstract-full" style="display: none;"> We present a far-infrared magneto-optical study of the gapped nodal-line semimetal ZrSiS in magnetic fields $B$ up to 7 T. The observed field-dependent features, which represent intra- (cyclotron resonance) and interband transitions, develop as $\sqrt{B}$ in increasing field and can be consistently explained within a simple 2D Dirac band model with a gap of 26 meV and an averaged Fermi velocity of $3\times10^{5}$ m/s. This indicates a rather narrow distribution of these parameters along the in-plane portions of the nodal line in the Brillouin zone. A field-induced feature with an energy position that does not depend on $B$ is also detected in the spectra. Possible origins of this feature are discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.07571v1-abstract-full').style.display = 'none'; document.getElementById('1910.07571v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 October, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">accepted to Phys. Rev. Research</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Research 1, 032015(R) (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1910.00184">arXiv:1910.00184</a> <span> [<a href="https://arxiv.org/pdf/1910.00184">pdf</a>, <a href="https://arxiv.org/format/1910.00184">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/1.5129689">10.1063/1.5129689 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Weyl nodes and magnetostructural instability in antiperovskite Mn$_3$ZnC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Teicher%2C+S+M+L">Samuel M. L. Teicher</a>, <a href="/search/cond-mat?searchtype=author&query=Svenningsson%2C+I+K">Ida K. Svenningsson</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Seshadri%2C+R">Ram Seshadri</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1910.00184v2-abstract-short" style="display: inline;"> The ferromagnetic phase of the cubic antiperovskite Mn$_3$ZnC is suggested from first-principles calculation to be a nodal line Weyl semimetal. Features in the electronic structure that are the hallmark of a nodal line Weyl state, a large density of linear band crossings near the Fermi level, can also be interpreted as signatures of a structural and/or magnetic instability. Indeed, it is known tha… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.00184v2-abstract-full').style.display = 'inline'; document.getElementById('1910.00184v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1910.00184v2-abstract-full" style="display: none;"> The ferromagnetic phase of the cubic antiperovskite Mn$_3$ZnC is suggested from first-principles calculation to be a nodal line Weyl semimetal. Features in the electronic structure that are the hallmark of a nodal line Weyl state, a large density of linear band crossings near the Fermi level, can also be interpreted as signatures of a structural and/or magnetic instability. Indeed, it is known that Mn$_3$ZnC undergoes transitions upon cooling from a paramagnetic to a cubic ferromagnetic state under ambient conditions and then further into a non-collinear ferrimagnetic tetragonal phase at a temperature between 250$\,$K and 200$\,$K. The existence of Weyl nodes and their destruction via structural and magnetic ordering is likely to be relevant to a range of magnetostructurally coupled materials. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.00184v2-abstract-full').style.display = 'none'; document.getElementById('1910.00184v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 December, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 September, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> APL Materials 7, 121104 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1909.06875">arXiv:1909.06875</a> <span> [<a href="https://arxiv.org/pdf/1909.06875">pdf</a>, <a href="https://arxiv.org/format/1909.06875">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> </div> <p class="title is-5 mathjax"> Superconducting order parameter of the nodal-line semimetal NaAlSi </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Muechler%2C+L">Lukas Muechler</a>, <a href="/search/cond-mat?searchtype=author&query=Guguchia%2C+Z">Zurab Guguchia</a>, <a href="/search/cond-mat?searchtype=author&query=Orain%2C+J">Jean-Christophe Orain</a>, <a href="/search/cond-mat?searchtype=author&query=Nuss%2C+J">J眉rgen Nuss</a>, <a href="/search/cond-mat?searchtype=author&query=Schoop%2C+L+M">Leslie M. Schoop</a>, <a href="/search/cond-mat?searchtype=author&query=Thomale%2C+R">Ronny Thomale</a>, <a href="/search/cond-mat?searchtype=author&query=von+Rohr%2C+F+O">Fabian O. von Rohr</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1909.06875v1-abstract-short" style="display: inline;"> Nodal-line semimetals are topologically non-trivial states of matter featuring band crossings along a closed curve, i.e. nodal-line, in momentum space. Through a detailed analysis of the electronic structure, we show for the first time that the normal state of the superconductor NaAlSi, with a critical temperature of $T_{\rm c} \approx$ 7 K, is a nodal-line semimetal, where the complex nodal-line… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.06875v1-abstract-full').style.display = 'inline'; document.getElementById('1909.06875v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1909.06875v1-abstract-full" style="display: none;"> Nodal-line semimetals are topologically non-trivial states of matter featuring band crossings along a closed curve, i.e. nodal-line, in momentum space. Through a detailed analysis of the electronic structure, we show for the first time that the normal state of the superconductor NaAlSi, with a critical temperature of $T_{\rm c} \approx$ 7 K, is a nodal-line semimetal, where the complex nodal-line structure is protected by non-symmorphic mirror crystal symmetries. We further report on muon spin rotation experiments revealing that the superconductivity in NaAlSi is truly of bulk nature, featuring a fully gapped Fermi-surface. The temperature-dependent magnetic penetration depth can be well described by a two-gap model consisting of two $s$-wave symmetric gaps with $螖_1 =$ 0.6(2) meV and $螖_2 =$ 1.39(1) meV. The zero-field muon experiment indicates that time-reversal symmetry is preserved in the superconducting state. Our observations suggest that notwithstanding its topologically non-trivial band structure, NaAlSi may be suitably interpreted as a conventional London superconductor, while more exotic superconducting gap symmetries cannot be excluded. The intertwining of topological electronic states and superconductivity renders NaAlSi a prototypical platform to search for unprecedented topological quantum phases. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.06875v1-abstract-full').style.display = 'none'; document.getElementById('1909.06875v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 September, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2019. </p> </li> </ol> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a href="/search/?searchtype=author&query=Schoop%2C+L+M&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Schoop%2C+L+M&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=Schoop%2C+L+M&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> </ul> </nav> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg> <a href="https://info.arxiv.org/help/contact.html"> Contact</a> </li> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>subscribe to arXiv mailings</title><desc>Click here to subscribe</desc><path d="M476 3.2L12.5 270.6c-18.1 10.4-15.8 35.6 2.2 43.2L121 358.4l287.3-253.2c5.5-4.9 13.3 2.6 8.6 8.3L176 407v80.5c0 23.6 28.5 32.9 42.5 15.8L282 426l124.6 52.2c14.2 6 30.4-2.9 33-18.2l72-432C515 7.8 493.3-6.8 476 3.2z"/></svg> <a href="https://info.arxiv.org/help/subscribe"> Subscribe</a> </li> </ul> </div> </div> </div>   <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/license/index.html">Copyright</a></li> <li><a href="https://info.arxiv.org/help/policies/privacy_policy.html">Privacy Policy</a></li> </ul> </div> <div class="column sorry-app-links"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/web_accessibility.html">Web Accessibility Assistance</a></li> <li> <p class="help"> <a class="a11y-main-link" href="https://status.arxiv.org" target="_blank">arXiv Operational Status <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 512" class="icon filter-dark_grey" role="presentation"><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"/></svg></a><br> Get status notifications via <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/email/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg>email</a> or <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/slack/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" class="icon filter-black" role="presentation"><path d="M94.12 315.1c0 25.9-21.16 47.06-47.06 47.06S0 341 0 315.1c0-25.9 21.16-47.06 47.06-47.06h47.06v47.06zm23.72 0c0-25.9 21.16-47.06 47.06-47.06s47.06 21.16 47.06 47.06v117.84c0 25.9-21.16 47.06-47.06 47.06s-47.06-21.16-47.06-47.06V315.1zm47.06-188.98c-25.9 0-47.06-21.16-47.06-47.06S139 32 164.9 32s47.06 21.16 47.06 47.06v47.06H164.9zm0 23.72c25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06H47.06C21.16 243.96 0 222.8 0 196.9s21.16-47.06 47.06-47.06H164.9zm188.98 47.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06h-47.06V196.9zm-23.72 0c0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06V79.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06V196.9zM283.1 385.88c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06v-47.06h47.06zm0-23.72c-25.9 0-47.06-21.16-47.06-47.06 0-25.9 21.16-47.06 47.06-47.06h117.84c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06H283.1z"/></svg>slack</a> </p> </li> </ul> </div> </div> </div>  </div> </footer> <script src="https://static.arxiv.org/static/base/1.0.0a5/js/member_acknowledgement.js"></script> </body> </html>

CINXE.COM

Search | arXiv e-print repository