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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=He%2C+Y&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=He%2C+Y&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=He%2C+Y&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> <li> <a href="/search/?searchtype=author&query=He%2C+Y&start=100" class="pagination-link " aria-label="Page 3" aria-current="page">3 </a> </li> <li> <a href="/search/?searchtype=author&query=He%2C+Y&start=150" class="pagination-link " aria-label="Page 4" aria-current="page">4 </a> </li> <li> <a href="/search/?searchtype=author&query=He%2C+Y&start=200" class="pagination-link " aria-label="Page 5" aria-current="page">5 </a> </li> <li><span class="pagination-ellipsis">…</span></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/2502.18385">arXiv:2502.18385</a> <span> [<a href="https://arxiv.org/pdf/2502.18385">pdf</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="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"> Monolithic On-Chip Phononic Chiral Anomalous Bulk States on LiNbO3 Thin-films </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Li%2C+Z">Zhe Li</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+Z">Zhen-Hui Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+S">Shu-Mao Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Hao%2C+C">Chen-Bei Hao</a>, <a href="/search/cond-mat?searchtype=author&query=Pan%2C+F">Fan-Yun Pan</a>, <a href="/search/cond-mat?searchtype=author&query=Yan%2C+H">Hao Yan</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yi-Han He</a>, <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+Y">Yan-Shen Zhou</a>, <a href="/search/cond-mat?searchtype=author&query=Yan%2C+X">Xue-Jun Yan</a>, <a href="/search/cond-mat?searchtype=author&query=Yu%2C+S">Si-Yuan Yu</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+C">Cheng He</a>, <a href="/search/cond-mat?searchtype=author&query=Lu%2C+M">Ming-Hui Lu</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+Y">Yan-Feng Chen</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="2502.18385v1-abstract-short" style="display: inline;"> Phononic materials are crucial for developing efficient, robust mechanical waveguides with strong transport properties, enabling advances in sensing, signal processing, energy harvesting, and microfluidics. A key motivation is their integration into monolithic systems for on-chip applications. While topological phononic materials developed in the past decade offer unidirectional edge states immune… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2502.18385v1-abstract-full').style.display = 'inline'; document.getElementById('2502.18385v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2502.18385v1-abstract-full" style="display: none;"> Phononic materials are crucial for developing efficient, robust mechanical waveguides with strong transport properties, enabling advances in sensing, signal processing, energy harvesting, and microfluidics. A key motivation is their integration into monolithic systems for on-chip applications. While topological phononic materials developed in the past decade offer unidirectional edge states immune to backscattering, their integration requires large volumes to control localized small volumes' transport properties, limiting their efficiency and application in modern phononic circuits. The recently introduced chiral anomalous bulk states (CABSs) combine the advantages of topological materials with innovative boundary designs, overcoming transmission limitations and ensuring full material utilization for superior wave propagation. Here, we present the first on-chip monolithic CABS device integrated on a suspended LiNbO3 thin film. This breakthrough enables the creation of phononic waveguides with unmatched unidirectionality, low loss, and high transmission efficiency, seamlessly integrated with broadband piezoelectric transducers, and showcasing their potential for high-fidelity, broad-bandwidth microwave signal transmission. Additionally, we exploit the slow-wave characteristics of CABSs for delay lines and high-density signal processing. Tailoring wave propagation through boundary engineering opens a new paradigm for phononic/photonic device design, with implications across microelectronics, high-frequency communications, radar, and advanced sensing technologies. The work sets the stage for the future development of highly scalable, multifunctional, and robust phononic systems, unlocking new avenues for integrated acoustic technologies. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2502.18385v1-abstract-full').style.display = 'none'; document.getElementById('2502.18385v1-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 February, 2025; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2025. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2502.15636">arXiv:2502.15636</a> <span> [<a href="https://arxiv.org/pdf/2502.15636">pdf</a>, <a href="https://arxiv.org/format/2502.15636">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mathematical Physics">math-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Exactly Solvable and Integrable Systems">nlin.SI</span> </div> </div> <p class="title is-5 mathjax"> Spin-$s$ $Q$-systems: Twist and Open Boundaries </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yi-Jun He</a>, <a href="/search/cond-mat?searchtype=author&query=Hou%2C+J">Jue Hou</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+Y">Yi-Chao Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Tan%2C+Z">Zi-Xi Tan</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="2502.15636v1-abstract-short" style="display: inline;"> In integrable spin chains, the spectral problem can be solved by the method of Bethe ansatz, which transforms the problem of diagonalization of the Hamiltonian into the problem of solving a set of algebraic equations named Bethe equations. In this work, we systematically investigate the spin-$s$ XXX chain with twisted and open boundary conditions using the rational $Q$-system, which is a powerful… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2502.15636v1-abstract-full').style.display = 'inline'; document.getElementById('2502.15636v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2502.15636v1-abstract-full" style="display: none;"> In integrable spin chains, the spectral problem can be solved by the method of Bethe ansatz, which transforms the problem of diagonalization of the Hamiltonian into the problem of solving a set of algebraic equations named Bethe equations. In this work, we systematically investigate the spin-$s$ XXX chain with twisted and open boundary conditions using the rational $Q$-system, which is a powerful tool to solve Bethe equations. We establish basic frameworks of the rational $Q$-system and confirm its completeness numerically in both cases. For twisted boundaries, we investigate the polynomiality conditions of the rational $Q$-system and derive physical conditions for singular solutions of Bethe equations. For open boundaries, we uncover novel phenomena such as hidden symmetries and magnetic strings under specific boundary parameters. Hidden symmetries lead to the appearance of extra degeneracies in the Hilbert space, while the magnetic string is a novel type of exact string configuration, whose length depends on the boundary magnetic fields. These findings, supported by both analytical and numerical evidences, offer new insights into the interplay between symmetries and boundary conditions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2502.15636v1-abstract-full').style.display = 'none'; document.getElementById('2502.15636v1-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 February, 2025; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2025. </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">41 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/2501.13303">arXiv:2501.13303</a> <span> [<a href="https://arxiv.org/pdf/2501.13303">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/acsaelm.4c01924">10.1021/acsaelm.4c01924 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Spontaneous Donor Defects and Voltage-Assisted Hole Doping in Beta-Gallium Oxides under Multiple Epitaxy Conditions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Nie%2C+C">Chenxi Nie</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+K">Kai Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Ke%2C+C">Chengxuan Ke</a>, <a href="/search/cond-mat?searchtype=author&query=Jiang%2C+X">Xisong Jiang</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yifeng He</a>, <a href="/search/cond-mat?searchtype=author&query=Deng%2C+Y">Yonghong Deng</a>, <a href="/search/cond-mat?searchtype=author&query=Yan%2C+Y">Yanhua Yan</a>, <a href="/search/cond-mat?searchtype=author&query=Luo%2C+G">Guangfu Luo</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="2501.13303v1-abstract-short" style="display: inline;"> Beta-phase gallium oxide (beta-Ga2O3) is prone to the spontaneous formation of donor defects but poses a formidable challenge in achieving high-quality p-type doping, mainly due to its exceptionally low valence band maximum (VBM). In this study, we utilize first-principles computations to investigate the origin of spontaneous donor defects in beta-Ga2O3 grown by three typical techniques: molecular… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.13303v1-abstract-full').style.display = 'inline'; document.getElementById('2501.13303v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2501.13303v1-abstract-full" style="display: none;"> Beta-phase gallium oxide (beta-Ga2O3) is prone to the spontaneous formation of donor defects but poses a formidable challenge in achieving high-quality p-type doping, mainly due to its exceptionally low valence band maximum (VBM). In this study, we utilize first-principles computations to investigate the origin of spontaneous donor defects in beta-Ga2O3 grown by three typical techniques: molecular beam epitaxy (MBE), metal organic chemical vapor deposition (MOCVD), and halide vapor phase epitaxy (HVPE). Our findings elucidate that the primary donor defects vary with the growth techniques, specifically Gai3+ for MBE, Hi+ and CGa+ for MOCVD, and (2VGa+Gai+2VO)+ and ClO+ for HVPE under unintentionally doped conditions. Employing a theoretically proposed voltage-assisted doping method, we computationally demonstrate that the dominant spontaneous donors can be significantly reduced accompanied by a noticeable increase in acceptors, leading to a stepwise reduction of Fermi level to 0.52, 0.88, and 2.10 eV above VBM for the MOCVD, HVPE, and MBE methods, and a hole concentration of 8.5*10^17, 8.7*10^11, and 2.7*10^-9 cm-3, respectively, at room temperature without the use of external dopants. By introducing Mg doping, we further reduce the Fermi level for both the MBE and HVPE experiments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.13303v1-abstract-full').style.display = 'none'; document.getElementById('2501.13303v1-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 January, 2025; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2025. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2501.11022">arXiv:2501.11022</a> <span> [<a href="https://arxiv.org/pdf/2501.11022">pdf</a>, <a href="https://arxiv.org/format/2501.11022">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="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> On the correlation between entanglement and the negative sign problem </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Xu%2C+P">Ping Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Shen%2C+Y">Yang Shen</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yuan-Yao He</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+M">Mingpu Qin</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="2501.11022v1-abstract-short" style="display: inline;"> In this work, we study the correlation between entanglement and the negative sign problem in quantum Monte Carlo for the simulation of low-dimensional strongly correlated quantum many body systems. Entanglement entropy characterizes the difficulty of many-body simulation with tensor network state related methods, while the average sign measures the difficulty in many-body simulation for a variety… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.11022v1-abstract-full').style.display = 'inline'; document.getElementById('2501.11022v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2501.11022v1-abstract-full" style="display: none;"> In this work, we study the correlation between entanglement and the negative sign problem in quantum Monte Carlo for the simulation of low-dimensional strongly correlated quantum many body systems. Entanglement entropy characterizes the difficulty of many-body simulation with tensor network state related methods, while the average sign measures the difficulty in many-body simulation for a variety of quantum Monte Carlo methods. Although there exist cases where one type of method works better than the other, it is desirable to find the possible correlation between entanglement and average sign for general hard strongly correlated systems regarding computational complexity. We take the doped two-dimensional Hubbard model as an example and numerically calculate the doping evolution of both the entanglement in the ground state with Density Matrix Renormalization Group and the average sign in the Auxiliary Field Quantum Monte Carlo simulation at low temperature. The results show that they are indeed correlated. The entanglement entropy (average sign) shows a peak (dip) around 20% doping, indicating that it is the difficult region for both methods. The vicinity of 20% doping is also the most intriguing region in both the Hubbard model and cuprate high-Tc superconductors where competing states with close energy intertwine with each other. Recognizing the correlation between entanglement and average sign provides new insight into our understanding of the difficulty in the simulation of strongly correlated quantum many-body systems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.11022v1-abstract-full').style.display = 'none'; document.getElementById('2501.11022v1-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 January, 2025; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2025. </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">5 pages, 2 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/2501.09885">arXiv:2501.09885</a> <span> [<a href="https://arxiv.org/pdf/2501.09885">pdf</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="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Low-Loss Superconducting Resonators Fabricated from Tantalum Films Grown at Room Temperature </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Marcaud%2C+G">Guillaume Marcaud</a>, <a href="/search/cond-mat?searchtype=author&query=Perello%2C+D">David Perello</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+C">Cliff Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Umbarkar%2C+E">Esha Umbarkar</a>, <a href="/search/cond-mat?searchtype=author&query=Weiland%2C+C">Conan Weiland</a>, <a href="/search/cond-mat?searchtype=author&query=Gao%2C+J">Jiansong Gao</a>, <a href="/search/cond-mat?searchtype=author&query=Diez%2C+S">Sandra Diez</a>, <a href="/search/cond-mat?searchtype=author&query=Ly%2C+V">Victor Ly</a>, <a href="/search/cond-mat?searchtype=author&query=Mahuli%2C+N">Neha Mahuli</a>, <a href="/search/cond-mat?searchtype=author&query=D%27Souza%2C+N">Nathan D'Souza</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yuan He</a>, <a href="/search/cond-mat?searchtype=author&query=Aghaeimeibodi%2C+S">Shahriar Aghaeimeibodi</a>, <a href="/search/cond-mat?searchtype=author&query=Resnick%2C+R">Rachel Resnick</a>, <a href="/search/cond-mat?searchtype=author&query=Jaye%2C+C">Cherno Jaye</a>, <a href="/search/cond-mat?searchtype=author&query=Rumaiz%2C+A+K">Abdul K. Rumaiz</a>, <a href="/search/cond-mat?searchtype=author&query=Fischer%2C+D+A">Daniel A. Fischer</a>, <a href="/search/cond-mat?searchtype=author&query=Hunt%2C+M">Matthew Hunt</a>, <a href="/search/cond-mat?searchtype=author&query=Painter%2C+O">Oskar Painter</a>, <a href="/search/cond-mat?searchtype=author&query=Jarrige%2C+I">Ignace Jarrige</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="2501.09885v1-abstract-short" style="display: inline;"> The use of $伪$-tantalum in superconducting circuits has enabled a considerable improvement of the coherence time of transmon qubits. The standard approach to grow $伪$-tantalum thin films on silicon involves heating the substrate, which takes several hours per deposition and prevents the integration of this material with wafers containing temperature-sensitive components. We report a detailed exper… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.09885v1-abstract-full').style.display = 'inline'; document.getElementById('2501.09885v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2501.09885v1-abstract-full" style="display: none;"> The use of $伪$-tantalum in superconducting circuits has enabled a considerable improvement of the coherence time of transmon qubits. The standard approach to grow $伪$-tantalum thin films on silicon involves heating the substrate, which takes several hours per deposition and prevents the integration of this material with wafers containing temperature-sensitive components. We report a detailed experimental study of an alternative growth method of $伪$-tantalum on silicon, which is achieved at room temperature through the use of a niobium seed layer. Despite a substantially higher density of oxygen-rich grain boundaries in the films sputtered at room temperature, resonators made from these films are found to have state-of-the-art quality factors, comparable to resonators fabricated from tantalum grown at high temperature. This finding challenges previous assumptions about correlations between material properties and microwave loss of superconducting thin films, and opens a new avenue for the integration of tantalum into fabrication flows with limited thermal budget. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.09885v1-abstract-full').style.display = 'none'; document.getElementById('2501.09885v1-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 January, 2025; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2025. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2501.08218">arXiv:2501.08218</a> <span> [<a href="https://arxiv.org/pdf/2501.08218">pdf</a>, <a href="https://arxiv.org/ps/2501.08218">ps</a>, <a href="https://arxiv.org/format/2501.08218">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/10.1063/1.3143614">10.1063/1.3143614 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Guided modes in graphene waveguides </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+F">Fan-Ming Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Ying He</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+X">Xi Chen</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="2501.08218v1-abstract-short" style="display: inline;"> By analogy of optical waveguides, we investigate the guided modes in graphene waveguides, which is made of symmetric quantum well. The unique properties of the graphene waveguide are discussed based on the two different dispersion relations, which correspond to classical motion and Klein tunneling, respectively. It is shown that the third-order mode is absent in the classical motion, while the fun… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.08218v1-abstract-full').style.display = 'inline'; document.getElementById('2501.08218v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2501.08218v1-abstract-full" style="display: none;"> By analogy of optical waveguides, we investigate the guided modes in graphene waveguides, which is made of symmetric quantum well. The unique properties of the graphene waveguide are discussed based on the two different dispersion relations, which correspond to classical motion and Klein tunneling, respectively. It is shown that the third-order mode is absent in the classical motion, while the fundamental mode is absent in the Klein tunneling case. We hope these phenomena can lead to the potential applications in graphene-based quantum devices. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.08218v1-abstract-full').style.display = 'none'; document.getElementById('2501.08218v1-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 January, 2025; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2025. </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">4 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Appl. Phys. Lett. 94, 212105 (2009) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2501.06555">arXiv:2501.06555</a> <span> [<a href="https://arxiv.org/pdf/2501.06555">pdf</a>, <a href="https://arxiv.org/ps/2501.06555">ps</a>, <a href="https://arxiv.org/format/2501.06555">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> </div> </div> <p class="title is-5 mathjax"> Chiral supersolid and dissipative time crystal in Rydberg-dressed Bose-Einstein condensates with Raman-induced spin-orbit coupling </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Su%2C+X">Xianghua Su</a>, <a href="/search/cond-mat?searchtype=author&query=Fu%2C+X">Xiping Fu</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yang He</a>, <a href="/search/cond-mat?searchtype=author&query=Shang%2C+Y">Ying Shang</a>, <a href="/search/cond-mat?searchtype=author&query=Ji%2C+K">Kaiyuan Ji</a>, <a href="/search/cond-mat?searchtype=author&query=Wen%2C+L">Linghua Wen</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="2501.06555v1-abstract-short" style="display: inline;"> Spin-orbit coupling (SOC) is one of the key factors that affect the chiral symmetry of matter by causing the spatial symmetry breaking of the system. We find that Raman-induced SOC can induce a chiral supersolid phase with a helical antiskyrmion lattice in balanced Rydberg-dressed two-component Bose-Einstein condensates (BECs) in a harmonic trap by modulating the Raman coupling strength, strong co… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.06555v1-abstract-full').style.display = 'inline'; document.getElementById('2501.06555v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2501.06555v1-abstract-full" style="display: none;"> Spin-orbit coupling (SOC) is one of the key factors that affect the chiral symmetry of matter by causing the spatial symmetry breaking of the system. We find that Raman-induced SOC can induce a chiral supersolid phase with a helical antiskyrmion lattice in balanced Rydberg-dressed two-component Bose-Einstein condensates (BECs) in a harmonic trap by modulating the Raman coupling strength, strong contrast with the mirror symmetric supersolid phase containing skyrmion-antiskyrmion lattice pair for the case of Rashba SOC. Two ground-state phase diagrams are presented as a function of the Rydberg interaction strength and the SOC strength, as well as that of the Rydberg interaction strength and the Raman coupling strength, respectively. It is shown that the interplay among Raman-induced SOC, soft-core long-range Rydberg interactions, and contact interactions favors rich ground-state structures including half-quantum vortex phase, stripe supersolid phase, toroidal stripe phase with a central Anderson-Toulouse coreless vortex, checkerboard supersolid phase, mirror symmetric supersolid phase, chiral supersolid phase and standing-wave supersolid phase. In addition, the effects of rotation and in-plane quadrupole magnetic field on the ground state of the system are analyzed. In these two cases, the chiral supersolid phase is broken and the ground state tends to form a miscible phase. Furthermore, the stability and superfluid properties of the two-component BECs with Raman-induced SOC and Rydberg interactions in free space are revealed by solving the Bogoliubov-de Gennes equation. Finally, we demonstrate that when the initial state is a chiral supersolid phase the rotating harmonic trapped system sustains dissipative continuous time crystal by studying the rotational dynamic behaviors of the system. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.06555v1-abstract-full').style.display = 'none'; document.getElementById('2501.06555v1-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 January, 2025; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2025. </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,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/2501.04688">arXiv:2501.04688</a> <span> [<a href="https://arxiv.org/pdf/2501.04688">pdf</a>, <a href="https://arxiv.org/format/2501.04688">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> </div> </div> <p class="title is-5 mathjax"> Observation of topological prethermal strong zero modes </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Jin%2C+F">Feitong Jin</a>, <a href="/search/cond-mat?searchtype=author&query=Jiang%2C+S">Si Jiang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+X">Xuhao Zhu</a>, <a href="/search/cond-mat?searchtype=author&query=Bao%2C+Z">Zehang Bao</a>, <a href="/search/cond-mat?searchtype=author&query=Shen%2C+F">Fanhao Shen</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+K">Ke Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+Z">Zitian Zhu</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+S">Shibo Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+Z">Zixuan Song</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+J">Jiachen Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Tan%2C+Z">Ziqi Tan</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+Y">Yaozu Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+C">Chuanyu Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Gao%2C+Y">Yu Gao</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+N">Ning Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Zou%2C+Y">Yiren Zou</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+A">Aosai Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+T">Tingting Li</a>, <a href="/search/cond-mat?searchtype=author&query=Zhong%2C+J">Jiarun Zhong</a>, <a href="/search/cond-mat?searchtype=author&query=Cui%2C+Z">Zhengyi Cui</a>, <a href="/search/cond-mat?searchtype=author&query=Han%2C+Y">Yihang Han</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yiyang He</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+H">Han Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+J">Jianan Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Y">Yanzhe Wang</a> , et al. (20 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="2501.04688v1-abstract-short" style="display: inline;"> Symmetry-protected topological phases cannot be described by any local order parameter and are beyond the conventional symmetry-breaking paradigm for understanding quantum matter. They are characterized by topological boundary states robust against perturbations that respect the protecting symmetry. In a clean system without disorder, these edge modes typically only occur for the ground states of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.04688v1-abstract-full').style.display = 'inline'; document.getElementById('2501.04688v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2501.04688v1-abstract-full" style="display: none;"> Symmetry-protected topological phases cannot be described by any local order parameter and are beyond the conventional symmetry-breaking paradigm for understanding quantum matter. They are characterized by topological boundary states robust against perturbations that respect the protecting symmetry. In a clean system without disorder, these edge modes typically only occur for the ground states of systems with a bulk energy gap and would not survive at finite temperatures due to mobile thermal excitations. Here, we report the observation of a distinct type of topological edge modes, which are protected by emergent symmetries and persist even up to infinite temperature, with an array of 100 programmable superconducting qubits. In particular, through digital quantum simulation of the dynamics of a one-dimensional disorder-free "cluster" Hamiltonian, we observe robust long-lived topological edge modes over up to 30 cycles at a wide range of temperatures. By monitoring the propagation of thermal excitations, we show that despite the free mobility of these excitations, their interactions with the edge modes are substantially suppressed in the dimerized regime due to an emergent U(1)$\times$U(1) symmetry, resulting in an unusually prolonged lifetime of the topological edge modes even at infinite temperature. In addition, we exploit these topological edge modes as logical qubits and prepare a logical Bell state, which exhibits persistent coherence in the dimerized and off-resonant regime, despite the system being disorder-free and far from its ground state. Our results establish a viable digital simulation approach to experimentally exploring a variety of finite-temperature topological phases and demonstrate a potential route to construct long-lived robust boundary qubits that survive to infinite temperature in disorder-free systems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.04688v1-abstract-full').style.display = 'none'; document.getElementById('2501.04688v1-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 January, 2025; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2025. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2501.04679">arXiv:2501.04679</a> <span> [<a href="https://arxiv.org/pdf/2501.04679">pdf</a>, <a href="https://arxiv.org/format/2501.04679">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</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"> Exploring nontrivial topology at quantum criticality in a superconducting processor </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Tan%2C+Z">Ziqi Tan</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+K">Ke Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+S">Sheng Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Shen%2C+F">Fanhao Shen</a>, <a href="/search/cond-mat?searchtype=author&query=Jin%2C+F">Feitong Jin</a>, <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+X">Xuhao Zhu</a>, <a href="/search/cond-mat?searchtype=author&query=Ji%2C+Y">Yujie Ji</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+S">Shibo Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+J">Jiachen Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+Y">Yaozu Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+C">Chuanyu Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Gao%2C+Y">Yu Gao</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+N">Ning Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Zou%2C+Y">Yiren Zou</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+A">Aosai Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+T">Tingting Li</a>, <a href="/search/cond-mat?searchtype=author&query=Bao%2C+Z">Zehang Bao</a>, <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+Z">Zitian Zhu</a>, <a href="/search/cond-mat?searchtype=author&query=Zhong%2C+J">Jiarun Zhong</a>, <a href="/search/cond-mat?searchtype=author&query=Cui%2C+Z">Zhengyi Cui</a>, <a href="/search/cond-mat?searchtype=author&query=Han%2C+Y">Yihang Han</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yiyang He</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+H">Han Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+J">Jianan Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Y">Yanzhe Wang</a> , et al. (15 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="2501.04679v1-abstract-short" style="display: inline;"> The discovery of nontrivial topology in quantum critical states has introduced a new paradigm for classifying quantum phase transitions and challenges the conventional belief that topological phases are typically associated with a bulk energy gap. However, realizing and characterizing such topologically nontrivial quantum critical states with large particle numbers remains an outstanding experimen… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.04679v1-abstract-full').style.display = 'inline'; document.getElementById('2501.04679v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2501.04679v1-abstract-full" style="display: none;"> The discovery of nontrivial topology in quantum critical states has introduced a new paradigm for classifying quantum phase transitions and challenges the conventional belief that topological phases are typically associated with a bulk energy gap. However, realizing and characterizing such topologically nontrivial quantum critical states with large particle numbers remains an outstanding experimental challenge in statistical and condensed matter physics. Programmable quantum processors can directly prepare and manipulate exotic quantum many-body states, offering a powerful path for exploring the physics behind these states. Here, we present an experimental exploration of the critical cluster Ising model by preparing its low-lying critical states on a superconducting processor with up to $100$ qubits. We develop an efficient method to probe the boundary $g$-function based on prepared low-energy states, which allows us to uniquely identify the nontrivial topology of the critical systems under study. Furthermore, by adapting the entanglement Hamiltonian tomography technique, we recognize two-fold topological degeneracy in the entanglement spectrum under periodic boundary condition, experimentally verifying the universal bulk-boundary correspondence in topological critical systems. Our results demonstrate the low-lying critical states as useful quantum resources for investigating the interplay between topology and quantum criticality. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.04679v1-abstract-full').style.display = 'none'; document.getElementById('2501.04679v1-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 January, 2025; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2025. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2412.20843">arXiv:2412.20843</a> <span> [<a href="https://arxiv.org/pdf/2412.20843">pdf</a>, <a href="https://arxiv.org/format/2412.20843">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="Quantum Gases">cond-mat.quant-gas</span> </div> </div> <p class="title is-5 mathjax"> Ising phase transitions and thermodynamics of correlated fermions in a 2D spin-dependent optical lattice </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Xie%2C+Z">Zhuotao Xie</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+Y">Yu-Feng Song</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yuan-Yao He</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="2412.20843v1-abstract-short" style="display: inline;"> We present a {\it numerically exact} study of the Hubbard model with spin-dependent anisotropic hopping on the square lattice using auxiliary-field quantum Monte Carlo method. At half-filling, the system undergoes Ising phase transitions upon cooling, leading to the formation of Ising-type antiferromagnetic order for repulsive interactions and charge density wave order for attractive interactions… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.20843v1-abstract-full').style.display = 'inline'; document.getElementById('2412.20843v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2412.20843v1-abstract-full" style="display: none;"> We present a {\it numerically exact} study of the Hubbard model with spin-dependent anisotropic hopping on the square lattice using auxiliary-field quantum Monte Carlo method. At half-filling, the system undergoes Ising phase transitions upon cooling, leading to the formation of Ising-type antiferromagnetic order for repulsive interactions and charge density wave order for attractive interactions at finite temperatures. By elegantly implementing the sign-problem-free condition and Hubbard-Stratonovich transformations, we achieve significant improvements in precision control of the numerical calculations, and obtain highly accurate results of the transition temperatures from weak to strong interactions across representative anisotropies. We further characterize the system by examining the temperature dependence of various thermodynamic properties, including the energy, double occupancy, specific heat and charge susceptibility. Specifically, we provide unbiased numerical results of the entropy map on temperature-interaction plane, the critical entropy, and the spin, singlon and doublon correlations, all of which are directly measurable in optical lattice experiments. Away from half-filling, we explore the behavior of the sign problem and investigate the possible emergence of stripe spin-density wave order in the system with repulsive interaction. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.20843v1-abstract-full').style.display = 'none'; document.getElementById('2412.20843v1-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 December, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">17 pages, 14 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/2412.20055">arXiv:2412.20055</a> <span> [<a href="https://arxiv.org/pdf/2412.20055">pdf</a>, <a href="https://arxiv.org/format/2412.20055">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="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> An Addressable and Tunable Module for Donor-based Scalable Silicon Quantum Computing </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+S">Shihang Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yu He</a>, <a href="/search/cond-mat?searchtype=author&query=Huang%2C+P">Peihao Huang</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="2412.20055v1-abstract-short" style="display: inline;"> Donor-based spin qubit offers a promising silicon quantum computing route for building large-scale qubit arrays, attributed to its long coherence time and advancements in nanoscale donor placement. However, the state-of-the-art device designs face scalability challenges, notably in achieving tunable two-qubit coupling and ensuring qubit addressability. Here, we propose a surface-code-compatible ar… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.20055v1-abstract-full').style.display = 'inline'; document.getElementById('2412.20055v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2412.20055v1-abstract-full" style="display: none;"> Donor-based spin qubit offers a promising silicon quantum computing route for building large-scale qubit arrays, attributed to its long coherence time and advancements in nanoscale donor placement. However, the state-of-the-art device designs face scalability challenges, notably in achieving tunable two-qubit coupling and ensuring qubit addressability. Here, we propose a surface-code-compatible architecture, where each module has both tunable two-qubit gates and addressable single-qubit gates by introducing only a single extra donor in a pair of donors. We found that to compromise between the requirement of tunability and that of addressability, an asymmetric scheme is necessary. In this scheme, the introduced extra donor is strongly tunnel-coupled to one of the donor spin qubits for addressable single-qubit operation, while being more weakly coupled to the other to ensure the turning on and off of the two-qubit operation. The fidelity of single-qubit and two-qubit gates can exceed the fault-tolerant threshold in our design. Additionally, the asymmetric scheme effectively mitigates valley oscillations, allowing for engineering precision tolerances up to a few nanometers. Thus, our proposed scheme presents a promising prototype for large-scale, fault-tolerant, donor-based spin quantum processors. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.20055v1-abstract-full').style.display = 'none'; document.getElementById('2412.20055v1-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 December, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2412.16411">arXiv:2412.16411</a> <span> [<a href="https://arxiv.org/pdf/2412.16411">pdf</a>, <a href="https://arxiv.org/ps/2412.16411">ps</a>, <a href="https://arxiv.org/format/2412.16411">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Artificial Intelligence">cs.AI</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Disordered Systems and Neural Networks">cond-mat.dis-nn</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Computational Complexity">cs.CC</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Machine Learning">stat.ML</span> </div> </div> <p class="title is-5 mathjax"> Knowledge as a Breaking of Ergodicity </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yang He</a>, <a href="/search/cond-mat?searchtype=author&query=Lubchenko%2C+V">Vassiliy Lubchenko</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="2412.16411v1-abstract-short" style="display: inline;"> We construct a thermodynamic potential that can guide training of a generative model defined on a set of binary degrees of freedom. We argue that upon reduction in description, so as to make the generative model computationally-manageable, the potential develops multiple minima. This is mirrored by the emergence of multiple minima in the free energy proper of the generative model itself. The varie… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.16411v1-abstract-full').style.display = 'inline'; document.getElementById('2412.16411v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2412.16411v1-abstract-full" style="display: none;"> We construct a thermodynamic potential that can guide training of a generative model defined on a set of binary degrees of freedom. We argue that upon reduction in description, so as to make the generative model computationally-manageable, the potential develops multiple minima. This is mirrored by the emergence of multiple minima in the free energy proper of the generative model itself. The variety of training samples that employ N binary degrees of freedom is ordinarily much lower than the size 2^N of the full phase space. The non-represented configurations, we argue, should be thought of as comprising a high-temperature phase separated by an extensive energy gap from the configurations composing the training set. Thus, training amounts to sampling a free energy surface in the form of a library of distinct bound states, each of which breaks ergodicity. The ergodicity breaking prevents escape into the near continuum of states comprising the high-temperature phase; thus it is necessary for proper functionality. It may however have the side effect of limiting access to patterns that were underrepresented in the training set. At the same time, the ergodicity breaking within the library complicates both learning and retrieval. As a remedy, one may concurrently employ multiple generative models -- up to one model per free energy minimum. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.16411v1-abstract-full').style.display = 'none'; document.getElementById('2412.16411v1-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> 20 December, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">51 pages, 12 figures, accepted to Neural Computation</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">MSC Class:</span> I.2.4; F.2.0 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2412.15001">arXiv:2412.15001</a> <span> [<a href="https://arxiv.org/pdf/2412.15001">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> </div> </div> <p class="title is-5 mathjax"> Observation of liquid-solid transition of nanoconfined water at ambient temperature </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Zheng%2C+W">Wentian Zheng</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+S">Shichen Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Jiang%2C+J">Jian Jiang</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yipeng He</a>, <a href="/search/cond-mat?searchtype=author&query=St%C3%B6hr%2C+R">Rainer St枚hr</a>, <a href="/search/cond-mat?searchtype=author&query=Denisenko%2C+A">Andrej Denisenko</a>, <a href="/search/cond-mat?searchtype=author&query=Wrachtrup%2C+J">J枚rg Wrachtrup</a>, <a href="/search/cond-mat?searchtype=author&query=Zeng%2C+X+C">Xiao Cheng Zeng</a>, <a href="/search/cond-mat?searchtype=author&query=Bian%2C+K">Ke Bian</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+E">En-Ge Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Jiang%2C+Y">Ying Jiang</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="2412.15001v1-abstract-short" style="display: inline;"> Nanoconfined water plays an indispensable role in various phenomena in biology, chemistry, and engineering. It exhibits many abnormal properties compared to bulk water, especially under strong confinement. However, the origin of those anomalies is still elusive due to the lack of structural information on hydrogen-bonding networks. Considering the inhomogeneity of the nanocavity and the tiny amoun… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.15001v1-abstract-full').style.display = 'inline'; document.getElementById('2412.15001v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2412.15001v1-abstract-full" style="display: none;"> Nanoconfined water plays an indispensable role in various phenomena in biology, chemistry, and engineering. It exhibits many abnormal properties compared to bulk water, especially under strong confinement. However, the origin of those anomalies is still elusive due to the lack of structural information on hydrogen-bonding networks. Considering the inhomogeneity of the nanocavity and the tiny amount of water molecules, conventional optical spectroscopies and nuclear magnetic resonance (NMR) fail to realize the structure analysis of nanoconfined water. Here, we addressed this issue by combining scanning probe microscopy (SPM) with advanced quantum sensing(QS) based on an atomic-size quantum sensor like nitrogen-vacancy (NV) center in diamond, which can apply the nanoscale-NMR for characterizing both the dynamics and structure of confined water at ambient conditions. We built a two-dimensional (2D) nanoconfined water system with a hexagonal-boron nitride (hBN) flake and a hydrophilic diamond surface. By using the SPM tip to measure the confinement size precisely, we observed a critical confinement size of ~2 nm, below which the water diffusion was significantly suppressed and the hydrogen-bonding network of water showed an ordered structure. Meanwhile, molecular dynamics (MD) simulation revealed a solid-like water contact layer on the diamond surface under strong confinement, which also reproduced the measured nanoscale-NMR spectra and confirmed the liquid-solid phase transition observed in the experiments. Notably, with this new SPM-QS platform, our results showed a promising way to elucidate the abnormal properties of nanoconfined water in future applications. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.15001v1-abstract-full').style.display = 'none'; document.getElementById('2412.15001v1-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 December, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2412.12869">arXiv:2412.12869</a> <span> [<a href="https://arxiv.org/pdf/2412.12869">pdf</a>, <a href="https://arxiv.org/format/2412.12869">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Exactly Solvable and Integrable Systems">nlin.SI</span> </div> </div> <p class="title is-5 mathjax"> Exact g-function without strings </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yi-Jun He</a>, <a href="/search/cond-mat?searchtype=author&query=Jiang%2C+Y">Yunfeng Jiang</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="2412.12869v1-abstract-short" style="display: inline;"> We propose a new approach to compute exact $g$-function for integrable quantum field theories with non-diagonal scattering S-matrices. The approach is based on an integrable lattice regularization of the quantum field theory. The exact $g$-function is encoded in the overlap of the integrable boundary state and the ground state on the lattice, which can be computed exactly by Bethe ansatz. In the c… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.12869v1-abstract-full').style.display = 'inline'; document.getElementById('2412.12869v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2412.12869v1-abstract-full" style="display: none;"> We propose a new approach to compute exact $g$-function for integrable quantum field theories with non-diagonal scattering S-matrices. The approach is based on an integrable lattice regularization of the quantum field theory. The exact $g$-function is encoded in the overlap of the integrable boundary state and the ground state on the lattice, which can be computed exactly by Bethe ansatz. In the continuum limit, after subtracting the contribution proportional to the volume of the closed channel, we obtain the exact $g$-function, given in terms of the counting function which is the solution of a nonlinear integral equation. The resulting $g$-function contains two parts, the scalar part, which depends on the boundary parameters and the ratio of Fredholm determinants, which is universal. This approach bypasses the difficulties of dealing with magnetic excitations for non-diagonal scattering theories in the framework of thermodynamic Bethe ansatz. We obtain numerical and analytical results of the exact $g$-function for the prototypical sine-Gordon theory with various integrable boundary conditions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.12869v1-abstract-full').style.display = 'none'; document.getElementById('2412.12869v1-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 December, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">7 pages, 3 figures (Supplemental Material 17 pages, 0 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/2412.05303">arXiv:2412.05303</a> <span> [<a href="https://arxiv.org/pdf/2412.05303">pdf</a>, <a href="https://arxiv.org/ps/2412.05303">ps</a>, <a href="https://arxiv.org/format/2412.05303">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="Quantum Physics">quant-ph</span> </div> </div> <p class="title is-5 mathjax"> Large enhancement of nonlinear optical response of graphene nanoribbon heterojunctions with multiple topological interface states </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Deng%2C+H">Hanying Deng</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+Y">Yaxin Li</a>, <a href="/search/cond-mat?searchtype=author&query=qu%2C+Z">Zhihao qu</a>, <a href="/search/cond-mat?searchtype=author&query=Deng%2C+J">Jing Deng</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yingji He</a>, <a href="/search/cond-mat?searchtype=author&query=Ye%2C+F">Fangwe Ye</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="2412.05303v1-abstract-short" style="display: inline;"> We investigate the nonlinear optical response of graphene nanoribbon (GNR) heterojunctions both without and with one or multiple topological interface states. By implementing a distant-neighbor quantum-mechanical (DNQM) method, we demonstrate a pronounced enhancement of the nonlinear optical response of GNR heterojunctions as the number of topological states at their interfaces increases. Specific… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.05303v1-abstract-full').style.display = 'inline'; document.getElementById('2412.05303v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2412.05303v1-abstract-full" style="display: none;"> We investigate the nonlinear optical response of graphene nanoribbon (GNR) heterojunctions both without and with one or multiple topological interface states. By implementing a distant-neighbor quantum-mechanical (DNQM) method, we demonstrate a pronounced enhancement of the nonlinear optical response of GNR heterojunctions as the number of topological states at their interfaces increases. Specifically, we find that GNR heterojunctions with multiple topological interface states exhibit a notably stronger third-order nonlinear optical response in comparison with the similarly sized counterparts with a single topological interface state or without such states. Furthermore, we observe that the presence of topological interface states in GNR heterojunctions can induce a significant red-shift in their quantum plasmon frequency. Our results reveal the potential to enhance the nonlinear optical response at the nanoscale by increasing the number of topological interface states in graphene nanostructures or other topological systems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.05303v1-abstract-full').style.display = 'none'; document.getElementById('2412.05303v1-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 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">9 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/2411.18696">arXiv:2411.18696</a> <span> [<a href="https://arxiv.org/pdf/2411.18696">pdf</a>, <a href="https://arxiv.org/format/2411.18696">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mathematical Physics">math-ph</span> </div> </div> <p class="title is-5 mathjax"> Logarithmic operators in $c=0$ bulk CFTs </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yifei He</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="2411.18696v1-abstract-short" style="display: inline;"> We study Kac operators (e.g. energy operator) in percolation and self-avoiding walk bulk CFTs with central charge $c=0$. The proper normalizations of these operators can be deduced at generic $c$ by requiring the finiteness and reality of the three-point constants in cluster and loop model CFTs. At $c=0$, Kac operators become zero-norm states and the bottom fields of logarithmic multiplets, and co… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.18696v1-abstract-full').style.display = 'inline'; document.getElementById('2411.18696v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.18696v1-abstract-full" style="display: none;"> We study Kac operators (e.g. energy operator) in percolation and self-avoiding walk bulk CFTs with central charge $c=0$. The proper normalizations of these operators can be deduced at generic $c$ by requiring the finiteness and reality of the three-point constants in cluster and loop model CFTs. At $c=0$, Kac operators become zero-norm states and the bottom fields of logarithmic multiplets, and comparison with $c<1$ Liouville CFT suggests the potential existence of arbitrarily high rank Jordan blocks. We give a generic construction of logarithmic operators based on Kac operators and focus on the rank-2 pair of the energy operator mixing with the hull operator. By taking the $c\to 0$ limit, we compute some of their conformal data and use this to investigate the operator algebra at $c=0$. Based on cluster decomposition, we find that, contrary to previous belief, the four-point correlation function of the bulk energy operator does not vanish at $c=0$, and a crucial role is played by its coupling to the rank-3 Jordan block associated with the second energy operator. This reveals the intriguing way zero-norm operators build long-range higher-point correlations through the intricate logarithmic structures in $c=0$ bulk CFTs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.18696v1-abstract-full').style.display = 'none'; document.getElementById('2411.18696v1-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 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">43 pages + appendices, 11 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/2411.16652">arXiv:2411.16652</a> <span> [<a href="https://arxiv.org/pdf/2411.16652">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"> Al0.68Sc0.32N/SiC based metal-ferroelectric-semiconductor capacitors operating up to 900 C </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yunfei He</a>, <a href="/search/cond-mat?searchtype=author&query=Moore%2C+D+C">David C. Moore</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Y">Yubo Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Ware%2C+S">Spencer Ware</a>, <a href="/search/cond-mat?searchtype=author&query=Ma%2C+S">Sizhe Ma</a>, <a href="/search/cond-mat?searchtype=author&query=Pradhan%2C+D+K">Dhiren K. Pradhan</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+Z">Zekun Hu</a>, <a href="/search/cond-mat?searchtype=author&query=Du%2C+X">Xingyu Du</a>, <a href="/search/cond-mat?searchtype=author&query=Kennedy%2C+W+J">W. Joshua Kennedy</a>, <a href="/search/cond-mat?searchtype=author&query=Glavin%2C+N+R">Nicholas R. Glavin</a>, <a href="/search/cond-mat?searchtype=author&query=Olsson%2C+R+H">Roy H. Olsson III</a>, <a href="/search/cond-mat?searchtype=author&query=Jariwala%2C+D">Deep Jariwala</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="2411.16652v1-abstract-short" style="display: inline;"> Ferroelectric (FE)-based devices show great promise for non-volatile memory applications, yet few demonstrate reliable operation at elevated temperatures. In this work, we fabricated and characterized metal ferroelectric semiconductor capacitors integrating Aluminum Scandium Nitride onto Silicon Carbide, a prospective high temperature semiconductor for logic operations in extreme environments. The… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.16652v1-abstract-full').style.display = 'inline'; document.getElementById('2411.16652v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.16652v1-abstract-full" style="display: none;"> Ferroelectric (FE)-based devices show great promise for non-volatile memory applications, yet few demonstrate reliable operation at elevated temperatures. In this work, we fabricated and characterized metal ferroelectric semiconductor capacitors integrating Aluminum Scandium Nitride onto Silicon Carbide, a prospective high temperature semiconductor for logic operations in extreme environments. The resultant Ni/Al0.68Sc0.32N/4H-SiC structure was evaluated for non-volatile memory performance from room temperature to high-temperature conditions. The 30-nm thick Al0.68Sc0.32N/SiC-based ferroelectric capacitors demonstrated ferroelectric switching at 900 C. The coercive field of the FE layer decreased linearly from -6.4/+11.9 MV cm-1 at room temperature to -3.1/+7.8 MV cm-1 at 800 C. Using positive-up negative-down measurements, we characterized the temperature dependence of remanent polarization. At 600 C, the devices achieved remarkable reliability, demonstrating endurance of ~2000 cycles and retention exceeding 100 hours with negligible polarization loss. Further reliability measurements extended to 800 C with 10,000 secs retention and > 300 endurance cycles, establish these devices as promising candidates for high-temperature memory applications. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.16652v1-abstract-full').style.display = 'none'; document.getElementById('2411.16652v1-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, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2411.13418">arXiv:2411.13418</a> <span> [<a href="https://arxiv.org/pdf/2411.13418">pdf</a>, <a href="https://arxiv.org/format/2411.13418">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"> Thermal Entropy, Density Disorder and Antiferromagnetism of Repulsive Fermions in 3D Optical Lattice </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Song%2C+Y">Yu-Feng Song</a>, <a href="/search/cond-mat?searchtype=author&query=Deng%2C+Y">Youjin Deng</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yuan-Yao He</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="2411.13418v1-abstract-short" style="display: inline;"> The celebrated antiferromagnetic phase transition was realized in a most recent optical lattice experiment for 3D fermionic Hubbard model [Shao {\it et al}., Nature {\bf 632}, 267 (2024)]. Despite the great achievement, it was observed that the AFM structure factor (and also the critical entropy) reaches the maximum around the interaction strength $U/t\simeq 11.75$, which is significantly larger t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.13418v1-abstract-full').style.display = 'inline'; document.getElementById('2411.13418v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.13418v1-abstract-full" style="display: none;"> The celebrated antiferromagnetic phase transition was realized in a most recent optical lattice experiment for 3D fermionic Hubbard model [Shao {\it et al}., Nature {\bf 632}, 267 (2024)]. Despite the great achievement, it was observed that the AFM structure factor (and also the critical entropy) reaches the maximum around the interaction strength $U/t\simeq 11.75$, which is significantly larger than the theoretical prediction as $U/t\simeq 8$. Here we resolve this discrepancy by studying the interplay between the thermal entropy, density disorder and antiferromagnetism of half-filled 3D Hubbard model with numerically exact auxiliary-field quantum Monte Carlo simulations. We have achieved accurate entropy phase diagram, which allows us to simulate arbitrary entropy path on the temperature-interaction plane and to track the experimental parameters. We then find that above discrepancy can be quantitatively explained by the {\it entropy increase} as enhancing the interaction in experiment, and together by the lattice {\it density disorder} existing in the experimental setup. We furthermore investigate the entropy dependence of double occupancy, and predict its universal behaviors which can be used as useful probes in future optical lattice experiments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.13418v1-abstract-full').style.display = 'none'; document.getElementById('2411.13418v1-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> 20 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">8 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/2410.00087">arXiv:2410.00087</a> <span> [<a href="https://arxiv.org/pdf/2410.00087">pdf</a>, <a href="https://arxiv.org/format/2410.00087">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</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"> A new series of 3D CFTs with $\mathrm{Sp}(N)$ global symmetry on fuzzy sphere </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+Z">Zheng Zhou</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yin-Chen He</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="2410.00087v1-abstract-short" style="display: inline;"> The quest to discover new 3D CFTs has been intriguing for physicists. For this purpose, fuzzy sphere reguarlisation that studies interacting quantum systems defined on the lowest Landau level on a sphere has emerged as a powerful tool. In this paper, we discover a series of new CFTs with global symmetry $\mathrm{Sp}(N)$ in the fuzzy sphere models that are closely related to the $\mathrm{SO}(5)$ de… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.00087v1-abstract-full').style.display = 'inline'; document.getElementById('2410.00087v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.00087v1-abstract-full" style="display: none;"> The quest to discover new 3D CFTs has been intriguing for physicists. For this purpose, fuzzy sphere reguarlisation that studies interacting quantum systems defined on the lowest Landau level on a sphere has emerged as a powerful tool. In this paper, we discover a series of new CFTs with global symmetry $\mathrm{Sp}(N)$ in the fuzzy sphere models that are closely related to the $\mathrm{SO}(5)$ deconfined phase transition, and are described by a $\mathrm{Sp}(N)/(\mathrm{Sp}(M)\times \mathrm{Sp}(N-M))$ non-linear sigma model with a Wess-Zumino-Witten term. We numerically verify the emergent conformal symmetry by observing the integer-spaced conformal multiplets and studying the finite-size scaling of the conformality. We discuss possible candidates for these newly discovered CFTs, the most plausible ones being Chern-Simons-matter theories which have $N$ flavour of gapless bosons or fermions coupled to a non-Abelian (viz. $\mathrm{Sp}(1)$, $\mathrm{Sp}(2)$, etc.) Chern-Simons gauge field. Our work provides new avenues for studying interacting CFTs in 3D, possibly facilitating the non-perturbative study of critical gauge theories and previously undiscovered CFTs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.00087v1-abstract-full').style.display = 'none'; document.getElementById('2410.00087v1-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 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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">13+15 pages, 4+3 figures, 1+5 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2409.15108">arXiv:2409.15108</a> <span> [<a href="https://arxiv.org/pdf/2409.15108">pdf</a>, <a href="https://arxiv.org/ps/2409.15108">ps</a>, <a href="https://arxiv.org/format/2409.15108">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</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/10.1103/PhysRevA.110.063308">10.1103/PhysRevA.110.063308 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Two-component repulsive atomic Fermi gases in a thin spherical shell </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yan He</a>, <a href="/search/cond-mat?searchtype=author&query=Chien%2C+C">Chih-Chun Chien</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="2409.15108v2-abstract-short" style="display: inline;"> We present possible ground-state structures of two-component atomic Fermi gases with repulsive interactions in a thin spherical shell geometry by implementing a self-consistent Hartree-Fock approximation. The system exhibits a miscible-immiscible transition from a homogeneous mixture to two-chunk phase separation as the interaction strength crosses a critical value. While the critical value is rel… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.15108v2-abstract-full').style.display = 'inline'; document.getElementById('2409.15108v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.15108v2-abstract-full" style="display: none;"> We present possible ground-state structures of two-component atomic Fermi gases with repulsive interactions in a thin spherical shell geometry by implementing a self-consistent Hartree-Fock approximation. The system exhibits a miscible-immiscible transition from a homogeneous mixture to two-chunk phase separation as the interaction strength crosses a critical value. While the critical value is relatively insensitive to population imbalance for equal-mass mixtures, it decreases with the mass ratio when mass-imbalance is present. The interaction may be tuned by the two-body scattering length or the radius of the sphere, thereby allowing the system to cross the transition by varying different parameters. When the atoms on the sphere are rotating, three-chunk sandwich structures emerge in mass-imbalanced mixtures as a consequence of maximal angular momentum along the rotation axis. Some indications of geometric effects and possible experimental implications are also discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.15108v2-abstract-full').style.display = 'none'; document.getElementById('2409.15108v2-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 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 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">8 pages, 7 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. A 110, 063308 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2409.13480">arXiv:2409.13480</a> <span> [<a href="https://arxiv.org/pdf/2409.13480">pdf</a>, <a href="https://arxiv.org/format/2409.13480">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"> Kinetic Energy Driven Ferromagnetic Insulator </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Ye%2C+J">Jinyuan Ye</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yuchi He</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+C">Congjun 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="2409.13480v2-abstract-short" style="display: inline;"> We construct a minimal model of interacting fermions establishing a ferromagnetic insulating phase. It is based on the Hubbard model on a trimerized triangular lattice in the regime of $U\gg t\gg |t^\prime|$ with $t>0$ and $t^\prime$ the intra- and inter-trimer hopping amplitudes, respectively. At the $\frac{1}{3}$-filling, each trimer becomes a triplet spin-1 moment, and the inter-trimer superexc… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.13480v2-abstract-full').style.display = 'inline'; document.getElementById('2409.13480v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.13480v2-abstract-full" style="display: none;"> We construct a minimal model of interacting fermions establishing a ferromagnetic insulating phase. It is based on the Hubbard model on a trimerized triangular lattice in the regime of $U\gg t\gg |t^\prime|$ with $t>0$ and $t^\prime$ the intra- and inter-trimer hopping amplitudes, respectively. At the $\frac{1}{3}$-filling, each trimer becomes a triplet spin-1 moment, and the inter-trimer superexchange is ferromagnetic with $J =- \frac{2}{27}\frac{t^{\prime 2}}{t}$ in the limit of $U/t=+\infty$. As $U/t$ becomes finite, the antiferromagnetic superexchange competes with the ferromagnetic one. The system enters into a frustrated antiferromagnetic insulator when $位>U/t\gg 1$ where $位\sim 10$. In contrast, a similar analysis performed on the trimerized Kagome lattice shows that only antiferromagnetic superchange exits at 1/3-filling. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.13480v2-abstract-full').style.display = 'none'; document.getElementById('2409.13480v2-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 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 September, 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/2409.12556">arXiv:2409.12556</a> <span> [<a href="https://arxiv.org/pdf/2409.12556">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="Applied Physics">physics.app-ph</span> </div> </div> <p class="title is-5 mathjax"> Increased resistance to photooxidation in Dion-Jacobson lead halide perovskites -- implication for perovskite device stability </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Ren%2C+Z">Zhilin Ren</a>, <a href="/search/cond-mat?searchtype=author&query=Ov%C4%8Dar%2C+J">Juraj Ov膷ar</a>, <a href="/search/cond-mat?searchtype=author&query=Leung%2C+T+L">Tik Lun Leung</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yanling He</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+Y">Yin Li</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+D">Dongyang Li</a>, <a href="/search/cond-mat?searchtype=author&query=Qin%2C+X">Xinshun Qin</a>, <a href="/search/cond-mat?searchtype=author&query=Mo%2C+H">Hongbo Mo</a>, <a href="/search/cond-mat?searchtype=author&query=Yuan%2C+Z">Zhengtian Yuan</a>, <a href="/search/cond-mat?searchtype=author&query=Bing%2C+J">Jueming Bing</a>, <a href="/search/cond-mat?searchtype=author&query=Bucknall%2C+M+P">Martin P. Bucknall</a>, <a href="/search/cond-mat?searchtype=author&query=Grisanti%2C+L">Luca Grisanti</a>, <a href="/search/cond-mat?searchtype=author&query=Ali%2C+M+U">Muhammad Umair Ali</a>, <a href="/search/cond-mat?searchtype=author&query=Bai%2C+P">Peng Bai</a>, <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+T">Tao Zhu</a>, <a href="/search/cond-mat?searchtype=author&query=Syed%2C+A+A">Ali Ashger Syed</a>, <a href="/search/cond-mat?searchtype=author&query=Lin%2C+J">Jingyang Lin</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+J">Jingbo Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Abdul-Khaleed"> Abdul-Khaleed</a>, <a href="/search/cond-mat?searchtype=author&query=Sun%2C+W">Wenting Sun</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+G">Gangyue Li</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+G">Gang Li</a>, <a href="/search/cond-mat?searchtype=author&query=Ng%2C+A+M+C">Alan Man Ching Ng</a>, <a href="/search/cond-mat?searchtype=author&query=Ho-Baillie%2C+A+W+Y">Anita W. Y. Ho-Baillie</a>, <a href="/search/cond-mat?searchtype=author&query=Lon%C4%8Dari%C4%87%2C+I">Ivor Lon膷ari膰</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="2409.12556v1-abstract-short" style="display: inline;"> 2D metal halide perovskites have enabled significant stability improvements in perovskite devices, particularly in resistance to moisture. However, some 2D perovskites are even more susceptible to photooxidation compared to 3D perovskites. This is particularly true for more commonly investigated Ruddlesden-Popper (RP) perovskites that exhibit increased susceptibility to photoinduced degradation co… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.12556v1-abstract-full').style.display = 'inline'; document.getElementById('2409.12556v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.12556v1-abstract-full" style="display: none;"> 2D metal halide perovskites have enabled significant stability improvements in perovskite devices, particularly in resistance to moisture. However, some 2D perovskites are even more susceptible to photooxidation compared to 3D perovskites. This is particularly true for more commonly investigated Ruddlesden-Popper (RP) perovskites that exhibit increased susceptibility to photoinduced degradation compared to Dion-Jacobson (DJ) perovskites. Comparisons between different RP and DJ perovskites reveal that this phenomenon cannot be explained by commonly proposed differences in superoxide ion generation, interlayer distance and lattice structural rigidity differences. Instead, the resistance to photooxidation of DJ perovskites can be attributed to decreased likelihood of double deprotonation events (compared to single deprotonation events in RP perovskites) required for the loss of organic cations and the perovskite decomposition. Consequently, DJ perovskites are less susceptible to oxidative degradation (both photo- and electrochemically induced), which leads to improved operational stability of solar cells based on these materials. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.12556v1-abstract-full').style.display = 'none'; document.getElementById('2409.12556v1-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 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">Main text: 19 pages, 6 figures, supplementary information: 62 pages, 47 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/2409.09308">arXiv:2409.09308</a> <span> [<a href="https://arxiv.org/pdf/2409.09308">pdf</a>, <a href="https://arxiv.org/format/2409.09308">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="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/PhysRevLett.133.216002">10.1103/PhysRevLett.133.216002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Two-Fold Anisotropic Superconductivity in Bilayer T$_d$-MoTe$_2$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Li%2C+Z">Zizhong Li</a>, <a href="/search/cond-mat?searchtype=author&query=Jindal%2C+A">Apoorv Jindal</a>, <a href="/search/cond-mat?searchtype=author&query=Strasser%2C+A">Alex Strasser</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yangchen He</a>, <a href="/search/cond-mat?searchtype=author&query=Zheng%2C+W">Wenkai Zheng</a>, <a href="/search/cond-mat?searchtype=author&query=Graf%2C+D">David Graf</a>, <a href="/search/cond-mat?searchtype=author&query=Taniguchi%2C+T">Takashi Taniguchi</a>, <a href="/search/cond-mat?searchtype=author&query=Watanabe%2C+K">Kenji Watanabe</a>, <a href="/search/cond-mat?searchtype=author&query=Balicas%2C+L">Luis Balicas</a>, <a href="/search/cond-mat?searchtype=author&query=Dean%2C+C+R">Cory R. Dean</a>, <a href="/search/cond-mat?searchtype=author&query=Qian%2C+X">Xiaofeng Qian</a>, <a href="/search/cond-mat?searchtype=author&query=Pasupathy%2C+A+N">Abhay N. Pasupathy</a>, <a href="/search/cond-mat?searchtype=author&query=Rhodes%2C+D+A">Daniel A. Rhodes</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="2409.09308v1-abstract-short" style="display: inline;"> Noncentrosymmetric 2D superconductors with large spin-orbit coupling offer an opportunity to explore superconducting behaviors far beyond the Pauli limit. One such superconductor, few-layer T$_d$-MoTe$_2$, has large upper critical fields that can exceed the Pauli limit by up to 600%. However, the mechanisms governing this enhancement are still under debate, with theory pointing towards either spin… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.09308v1-abstract-full').style.display = 'inline'; document.getElementById('2409.09308v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.09308v1-abstract-full" style="display: none;"> Noncentrosymmetric 2D superconductors with large spin-orbit coupling offer an opportunity to explore superconducting behaviors far beyond the Pauli limit. One such superconductor, few-layer T$_d$-MoTe$_2$, has large upper critical fields that can exceed the Pauli limit by up to 600%. However, the mechanisms governing this enhancement are still under debate, with theory pointing towards either spin-orbit parity coupling or tilted Ising spin-orbit coupling. Moreover, ferroelectricity concomitant with superconductivity has been recently observed in the bilayer, where strong changes to superconductivity can be observed throughout the ferroelectric transition pathway. Here, we report the superconducting behavior of bilayer T$_d$-MoTe$ _2$ under an in-plane magnetic field, while systematically varying magnetic field angle and out-of-plane electric field strength. We find that superconductivity in bilayer MoTe$_2$ exhibits a two-fold symmetry with an upper critical field maxima occurring along the b-axis and minima along the a-axis. The two-fold rotational symmetry remains robust throughout the entire superconducting region and ferroelectric hysteresis loop. Our experimental observations of the spin-orbit coupling strength (up to 16.4 meV) agree with the spin texture and spin splitting from first-principles calculations, indicating that tilted Ising spin-orbit coupling is the dominant underlying mechanism. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.09308v1-abstract-full').style.display = 'none'; document.getElementById('2409.09308v1-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 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">Journal ref:</span> Phys. Rev. Lett. 133, (2024) 216002 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2409.06933">arXiv:2409.06933</a> <span> [<a href="https://arxiv.org/pdf/2409.06933">pdf</a>, <a href="https://arxiv.org/format/2409.06933">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="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> </div> <p class="title is-5 mathjax"> Cascade of strongly correlated quantum states in a partially filled kagome flat band </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Chen%2C+C">Caiyun Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Zheng%2C+J">Jiangchang Zheng</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yuman He</a>, <a href="/search/cond-mat?searchtype=author&query=Ying%2C+X">Xuzhe Ying</a>, <a href="/search/cond-mat?searchtype=author&query=Sankar%2C+S">Soumya Sankar</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+L">Luanjing Li</a>, <a href="/search/cond-mat?searchtype=author&query=Wei%2C+Y">Yizhou Wei</a>, <a href="/search/cond-mat?searchtype=author&query=Dai%2C+X">Xi Dai</a>, <a href="/search/cond-mat?searchtype=author&query=Po%2C+H+C">Hoi Chun Po</a>, <a href="/search/cond-mat?searchtype=author&query=J%C3%A4ck%2C+B">Berthold J盲ck</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="2409.06933v1-abstract-short" style="display: inline;"> Coulomb interactions among charge carriers that occupy an electronic flat band have a profound impact on the macroscopic properties of materials. At sufficient strength, these interactions can give rise to captivating phenomena such as quantum criticality, Mott-Hubbard states, and unconventional superconductivity. The appearance of these characteristics sensitively depends on the number of electro… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.06933v1-abstract-full').style.display = 'inline'; document.getElementById('2409.06933v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.06933v1-abstract-full" style="display: none;"> Coulomb interactions among charge carriers that occupy an electronic flat band have a profound impact on the macroscopic properties of materials. At sufficient strength, these interactions can give rise to captivating phenomena such as quantum criticality, Mott-Hubbard states, and unconventional superconductivity. The appearance of these characteristics sensitively depends on the number of electrons occupying the flat band states. In this work, we present experimental evidence obtained from scanning tunneling microscopy measurements for a cascade of strongly correlated states appearing in the partially occupied kagome flat bands of Co$_{1-x}$Fe$_x$Sn whose filling can be controlled by the Fe-doping level $x$. At elevated temperatures ($T\geq16\,K$), we detect a nematic electronic state across a broad doping range $0.05<x<0.25$. The comparison with model calculations reveals that strong Coulomb interactions ($U>100\,$meV) blend the states of two $3d$-orbital derived flat bands and impart a nematic order parameter. This state serves as the parent phase of a strongly correlated phase diagram: At lower temperatures $T<16\,$K, we find spectroscopic evidence for an orbital-selective Mott state enabled by the $3d$-orbital degeneracy of the Co atom. This state can only be detected in samples with ideal Fe doping ($x=0.17$) and descends into pseudogap phases upon electron and hole doping. At $T<8\,$K, the pseudogap phase evolves into another nematic low temperature state. Our observations demonstrate that the electronic ground state of a kagome flat band depends on the complex interplay between strong Coulomb repulsion, $3d$-orbital degeneracy, and flat band filling fraction at different temperatures. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.06933v1-abstract-full').style.display = 'none'; document.getElementById('2409.06933v1-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 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">13 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/2408.01685">arXiv:2408.01685</a> <span> [<a href="https://arxiv.org/pdf/2408.01685">pdf</a>, <a href="https://arxiv.org/format/2408.01685">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"> Contrasting electron-phonon interaction between electron- and hole-doped cuprates </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Guo%2C+Q">Qinda Guo</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+K">Ke-Jun Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Berntsen%2C+M+H">Magnus H. Berntsen</a>, <a href="/search/cond-mat?searchtype=author&query=Grubi%C5%A1i%C4%87-%C4%8Cabo%2C+A">Antonija Grubi拧i膰-膶abo</a>, <a href="/search/cond-mat?searchtype=author&query=Dendzik%2C+M">Maciej Dendzik</a>, <a href="/search/cond-mat?searchtype=author&query=Balasubramanian%2C+T">Thiagarajan Balasubramanian</a>, <a href="/search/cond-mat?searchtype=author&query=Polley%2C+C">Craig Polley</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+S">Su-Di Chen</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+J">Junfeng He</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yu He</a>, <a href="/search/cond-mat?searchtype=author&query=Rotundu%2C+C+R">Costel R. Rotundu</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+Y+S">Young S. Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Hashimoto%2C+M">Makoto Hashimoto</a>, <a href="/search/cond-mat?searchtype=author&query=Lu%2C+D">Dong-Hui Lu</a>, <a href="/search/cond-mat?searchtype=author&query=Devereaux%2C+T+P">Thomas P. Devereaux</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+D">Dung-Hai Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Shen%2C+Z">Zhi-Xun Shen</a>, <a href="/search/cond-mat?searchtype=author&query=Tjernberg%2C+O">Oscar Tjernberg</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="2408.01685v1-abstract-short" style="display: inline;"> Spin- and charge-lattice interactions are potential key factors in the microscopic mechanism of high-temperature superconductivity in cuprates. Although both interactions can dramatically shape the low-energy electronic structure, their phenomenological roles in superconductivity are usually investigated independently. Employing angle-resolved photoemission spectroscopy, we reveal the spectroscopi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.01685v1-abstract-full').style.display = 'inline'; document.getElementById('2408.01685v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2408.01685v1-abstract-full" style="display: none;"> Spin- and charge-lattice interactions are potential key factors in the microscopic mechanism of high-temperature superconductivity in cuprates. Although both interactions can dramatically shape the low-energy electronic structure, their phenomenological roles in superconductivity are usually investigated independently. Employing angle-resolved photoemission spectroscopy, we reveal the spectroscopic fingerprint of short-range antiferromagnetic order in conjunction with enhanced electron-phonon interaction in the electron-doped cuprate superconductor $\mathrm{Nd_{1.85}Ce_{0.15}CuO_4}$. The observed mode coupling exhibits a strong momentum dependence that is in striking contrast to the node-antinode dichotomy previously observed in the hole-doped cuprates. Our results reveal an intimate relationship between electron-phonon coupling and antiferromagnetic fluctuations, which collectively sets the stage for unconventional superconductivity in the electron-doped cuprates. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.01685v1-abstract-full').style.display = 'none'; document.getElementById('2408.01685v1-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 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2407.11886">arXiv:2407.11886</a> <span> [<a href="https://arxiv.org/pdf/2407.11886">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"> Automated production of batched unclonable micro-patterns anti-counterfeiting labels with strong robustness and rapid recognition speed </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yuzheng He</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+Z">Zunshuai Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Xing%2C+Y">Yifei Xing</a>, <a href="/search/cond-mat?searchtype=author&query=Lang%2C+Z">Zhiyuan Lang</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+J">Jinbo Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+J">Jiong Yang</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="2407.11886v1-abstract-short" style="display: inline;"> Anti-counterfeiting technologies are indeed crucial for information security and protecting product authenticity. Traditional anti-counterfeiting methods have their limitations due to their clonable nature. Exploring new technologies, particularly those based on pixel-level textures is a promising avenue to address the clonable issue due to high encoding capacity. However, research in this field i… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.11886v1-abstract-full').style.display = 'inline'; document.getElementById('2407.11886v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.11886v1-abstract-full" style="display: none;"> Anti-counterfeiting technologies are indeed crucial for information security and protecting product authenticity. Traditional anti-counterfeiting methods have their limitations due to their clonable nature. Exploring new technologies, particularly those based on pixel-level textures is a promising avenue to address the clonable issue due to high encoding capacity. However, research in this field is still in its infancy. This work introduces a new fluorescent anti-counterfeiting label technology with four key characteristics: efficient laser etching, high-throughput fabrication and segmentation, robustness aided by data augmentation, and an exceptionally high recognition speed. To be specific, the etching achieves a speed of 1,200 labels/3s, the high throughput yields a rate of 2,400 labels/4 min, and a total count of 51,966 labels. The number of labels is further augmented to 5,196,600 by implementing arbitrary rotation and brightness variation to enhance the robustness in the recognition procedure. We divide these labels into 44 categories based on differences in patterns. Utilizing machine learning methods, we have achieved a total recognition (including extraction and search process) time per label averaging 421.96 ms without classification, and 40.13 ms with classification. Specifically, the search process with classification is nearly fiftieth times shorter than the non-classification method, reaching 8.52 milliseconds in average. The overall recognition time is much faster than previous works, and achieve an accuracy over 98.7%. This work significantly increases the practicality of pixel-level anti-counterfeiting labels. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.11886v1-abstract-full').style.display = 'none'; document.getElementById('2407.11886v1-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 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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, 8 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">MSC Class:</span> 68U10; 92E99 <span class="has-text-black-bis has-text-weight-semibold">ACM Class:</span> J.2; J.7 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2407.08603">arXiv:2407.08603</a> <span> [<a href="https://arxiv.org/pdf/2407.08603">pdf</a>, <a href="https://arxiv.org/format/2407.08603">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="Quantum Gases">cond-mat.quant-gas</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.111.035123">10.1103/PhysRevB.111.035123 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Magnetic, thermodynamic, and dynamical properties of the three-dimensional fermionic Hubbard model: A comprehensive Monte Carlo study </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Song%2C+Y">Yu-Feng Song</a>, <a href="/search/cond-mat?searchtype=author&query=Deng%2C+Y">Youjin Deng</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yuan-Yao He</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="2407.08603v2-abstract-short" style="display: inline;"> The interplay between quantum and thermal fluctuations can induce rich phenomena at finite temperatures in strongly correlated fermion systems. Here we report a {\it numerically exact} auxiliary-field quantum Monte Carlo (AFQMC) study for the finite-temperature properties of three-dimensional repulsive Hubbard model at half filling. We concentrate on the complete temperature-interaction strength p… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.08603v2-abstract-full').style.display = 'inline'; document.getElementById('2407.08603v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.08603v2-abstract-full" style="display: none;"> The interplay between quantum and thermal fluctuations can induce rich phenomena at finite temperatures in strongly correlated fermion systems. Here we report a {\it numerically exact} auxiliary-field quantum Monte Carlo (AFQMC) study for the finite-temperature properties of three-dimensional repulsive Hubbard model at half filling. We concentrate on the complete temperature-interaction strength phase diagram of the model, which contains the low-temperature antiferromagnetic (AFM) long-range ordered phase and metal-insulator crossover (MIC) in the paramagnetic phase. Enabling access to unprecedented system sizes up to $20^3$, we achieve highly accurate results of the N茅el transition temperature for representative values of on-site interaction $U$ via finite-size analysis of AFM structure factor. To quantitatively characterize the MIC above the N茅el transition, we have developed fully new techniques allowing to compute the thermal entropy versus $U$ at fixed temperature and to directly calculate the $U$-derivative of double occupancy in AFQMC simulations. Then combining variously thermodynamic and dynamical observables, we establish an efficient scheme to precisely determine the boundaries for the MIC by cross-checking different observables. We also demonstrate the temperature dependence of many commonly used observables. Away from half filling, we explore the behavior of the sign problem and AFM spin correlation versus hole doping, and demonstrate the persistance of N茅el AFM ordered phase to finite doping with limited results. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.08603v2-abstract-full').style.display = 'none'; document.getElementById('2407.08603v2-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 December, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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">32 pages, 24 figures; Accepted by Phys. Rev. B</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 111, 035123 (2025) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2406.10186">arXiv:2406.10186</a> <span> [<a href="https://arxiv.org/pdf/2406.10186">pdf</a>, <a href="https://arxiv.org/format/2406.10186">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</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"> Impurities with a cusp: general theory and 3d Ising </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Cuomo%2C+G">Gabriel Cuomo</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yin-Chen He</a>, <a href="/search/cond-mat?searchtype=author&query=Komargodski%2C+Z">Zohar Komargodski</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="2406.10186v3-abstract-short" style="display: inline;"> In CFTs, the partition function of a line defect with a cusp depends logarithmically on the size of the line with an angle-dependent coefficient: the cusp anomalous dimension. In the first part of this work, we study the general properties of the cusp anomalous dimension. We relate the small cusp angle limit to the effective field theory of defect fusion, making predictions for the first couple of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.10186v3-abstract-full').style.display = 'inline'; document.getElementById('2406.10186v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2406.10186v3-abstract-full" style="display: none;"> In CFTs, the partition function of a line defect with a cusp depends logarithmically on the size of the line with an angle-dependent coefficient: the cusp anomalous dimension. In the first part of this work, we study the general properties of the cusp anomalous dimension. We relate the small cusp angle limit to the effective field theory of defect fusion, making predictions for the first couple of terms in the expansion. Using a concavity property of the cusp anomalous dimension we argue that the Casimir energy between a line defect and its orientation reversal is always negative ("opposites attract"). We use these results to determine the fusion algebra of Wilson lines in $\mathcal{N}=4$ SYM as well as pinning field defects in the Wilson-Fisher fixed points. In the second part of the paper we obtain nonperturbative numerical results for the cusp anomalous dimension of pinning field defects in the Ising model in $d=3$, using the recently developed fuzzy-sphere regularization. We also compute the pinning field cusp anomalous dimension in the $O(N)$ model at one-loop in the $\varepsilon$-expansion. Our results are in agreement with the general theory developed in the first part of the work, and we make several predictions for impurities in magnets. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.10186v3-abstract-full').style.display = 'none'; document.getElementById('2406.10186v3-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 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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">35 pages + appendices, 15 figures; v2 typos fixed; v3 journal version</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2406.05608">arXiv:2406.05608</a> <span> [<a href="https://arxiv.org/pdf/2406.05608">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="Chemical Physics">physics.chem-ph</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"> Janus graphene nanoribbons with a single ferromagnetic zigzag edge </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Song%2C+S">Shaotang Song</a>, <a href="/search/cond-mat?searchtype=author&query=Teng%2C+Y">Yu Teng</a>, <a href="/search/cond-mat?searchtype=author&query=Tang%2C+W">Weichen Tang</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+Z">Zhen Xu</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yuanyuan He</a>, <a href="/search/cond-mat?searchtype=author&query=Ruan%2C+J">Jiawei Ruan</a>, <a href="/search/cond-mat?searchtype=author&query=Kojima%2C+T">Takahiro Kojima</a>, <a href="/search/cond-mat?searchtype=author&query=Hu%2C+W">Wenping Hu</a>, <a href="/search/cond-mat?searchtype=author&query=Giessibl%2C+F+J">Franz J Giessibl</a>, <a href="/search/cond-mat?searchtype=author&query=Sakaguchi%2C+H">Hiroshi Sakaguchi</a>, <a href="/search/cond-mat?searchtype=author&query=Louie%2C+S+G">Steven G Louie</a>, <a href="/search/cond-mat?searchtype=author&query=Lu%2C+J">Jiong Lu</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="2406.05608v2-abstract-short" style="display: inline;"> Topological design of pi-electrons in zigzag-edged graphene nanoribbons (ZGNRs) leads to a wealth of magnetic quantum phenomena and exotic quantum phases. Symmetric ZGNRs typically exhibit antiferromagnetically coupled spin-ordered edge states. Eliminating cross-edge magnetic coupling in ZGNRs not only enables the realization of a new class of ferromagnetic quantum spin chains, enabling the explor… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.05608v2-abstract-full').style.display = 'inline'; document.getElementById('2406.05608v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2406.05608v2-abstract-full" style="display: none;"> Topological design of pi-electrons in zigzag-edged graphene nanoribbons (ZGNRs) leads to a wealth of magnetic quantum phenomena and exotic quantum phases. Symmetric ZGNRs typically exhibit antiferromagnetically coupled spin-ordered edge states. Eliminating cross-edge magnetic coupling in ZGNRs not only enables the realization of a new class of ferromagnetic quantum spin chains, enabling the exploration of quantum spin physics and entanglement of multiple qubits in the 1D limit, but also establishes a long-sought carbon-based ferromagnetic transport channel, pivotal for ultimate scaling of GNR-based quantum electronics. However, designing such GNRs entails overcoming daunting challenges, including simultaneous breaking of structural and spin symmetries, and designing elegant precursors for asymmetric fabrication of reactive zigzag edges. Here, we report a general approach for designing and fabricating such ferromagnetic GNRs in the form of Janus GNRs with two distinct edge configurations. Guided by Lieb's theorem and topological classification theory, we devised two JGNRs by asymmetrically introduced a topological defect array of benzene motifs to one zigzag edge, while keeping the opposing zigzag edge unchanged. This breaks structural symmetry and creates a sublattice imbalance within each unit cell, initiating a spin symmetry breaking. Three Z-shape precursors are designed to fabricate one parent ZGNR and two JGNRs with an optimal lattice spacing of the defect array for a complete quench of the magnetic edge states at the defective edge. Characterization via scanning probe microscopy/spectroscopy and first-principles density functional theory confirms the successful fabrication of Janus GNRs with ferromagnetic ground state delocalised along the pristine zigzag edge. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.05608v2-abstract-full').style.display = 'none'; document.getElementById('2406.05608v2-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 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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, 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/2406.04445">arXiv:2406.04445</a> <span> [<a href="https://arxiv.org/pdf/2406.04445">pdf</a>, <a href="https://arxiv.org/format/2406.04445">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="Strongly Correlated Electrons">cond-mat.str-el</span> </div> </div> <p class="title is-5 mathjax"> Explainable Machine Learning Identification of Superconductivity from Single-Particle Spectral Functions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Chen%2C+X">Xu Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Sun%2C+Y">Yuanjie Sun</a>, <a href="/search/cond-mat?searchtype=author&query=Hruska%2C+E">Eugen Hruska</a>, <a href="/search/cond-mat?searchtype=author&query=Dixit%2C+V">Vivek Dixit</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+J">Jinming Yang</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yu He</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Y">Yao Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+F">Fang Liu</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="2406.04445v1-abstract-short" style="display: inline;"> The traditional method of identifying symmetry-breaking phase transitions through the emergence of a single-particle gap encounters significant challenges in quantum materials with strong fluctuations. To address this, we have developed a data-driven approach using a domain-adversarial neural network trained on simulated spectra of cuprates. This model compensates for the scarcity of experimental… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.04445v1-abstract-full').style.display = 'inline'; document.getElementById('2406.04445v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2406.04445v1-abstract-full" style="display: none;"> The traditional method of identifying symmetry-breaking phase transitions through the emergence of a single-particle gap encounters significant challenges in quantum materials with strong fluctuations. To address this, we have developed a data-driven approach using a domain-adversarial neural network trained on simulated spectra of cuprates. This model compensates for the scarcity of experimental data -- a significant barrier to the wide deployment of machine learning in physical research -- by leveraging the abundance of theoretically simulated data. When applied to unlabeled experimental spectra, our model successfully distinguishes the true superconducting states from gapped fluctuating states, without the need for fine temperature sampling across the transition. Further, the explanation of our machine learning model reveals the crucial role of the Fermi-surface spectral intensity even in gapped states. It paves the way for robust and direct spectroscopic identification of fluctuating orders, particularly in low-dimensional, strongly correlated materials. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.04445v1-abstract-full').style.display = 'none'; document.getElementById('2406.04445v1-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, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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">8 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/2406.01064">arXiv:2406.01064</a> <span> [<a href="https://arxiv.org/pdf/2406.01064">pdf</a>, <a href="https://arxiv.org/format/2406.01064">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.109.184418">10.1103/PhysRevB.109.184418 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Antiferromagnetic order in a layered magnetic topological insulator MnBi$_2$Se$_4$ probed by resonant soft x-ray scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Chen%2C+X">Xiang Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Ruiz%2C+A">Alejandro Ruiz</a>, <a href="/search/cond-mat?searchtype=author&query=Bishop%2C+A+J">Alexander J. Bishop</a>, <a href="/search/cond-mat?searchtype=author&query=Gunn%2C+B">Brandon Gunn</a>, <a href="/search/cond-mat?searchtype=author&query=Basak%2C+R">Rourav Basak</a>, <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+T">Tiancong Zhu</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yu He</a>, <a href="/search/cond-mat?searchtype=author&query=Vranas%2C+M">Mayia Vranas</a>, <a href="/search/cond-mat?searchtype=author&query=Weschke%2C+E">Eugen Weschke</a>, <a href="/search/cond-mat?searchtype=author&query=Kawakami%2C+R+K">Roland K. Kawakami</a>, <a href="/search/cond-mat?searchtype=author&query=Birgeneau%2C+R+J">Robert J. Birgeneau</a>, <a href="/search/cond-mat?searchtype=author&query=Frano%2C+A">Alex Frano</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="2406.01064v1-abstract-short" style="display: inline;"> The quasi-two-dimensional magnetic topological insulator MnBi$_2$Se$_4$, stabilized via non-equilibrium molecular beam epitaxy, is investigated by resonant soft x-ray scattering. Kiessig fringes are observed, confirming a high sample quality and a thin film thickness of 10 septuple layers ($\sim$13 nm). An antiferromagnetic Bragg peak is observed at the structurally forbidden reflection, whose mag… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.01064v1-abstract-full').style.display = 'inline'; document.getElementById('2406.01064v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2406.01064v1-abstract-full" style="display: none;"> The quasi-two-dimensional magnetic topological insulator MnBi$_2$Se$_4$, stabilized via non-equilibrium molecular beam epitaxy, is investigated by resonant soft x-ray scattering. Kiessig fringes are observed, confirming a high sample quality and a thin film thickness of 10 septuple layers ($\sim$13 nm). An antiferromagnetic Bragg peak is observed at the structurally forbidden reflection, whose magnetic nature is validated by studying its temperature, energy, and polarization dependence. Through a detailed analysis, an A-type antiferromagetic order with in-plane moments is implied. This alternative spin structure in MnBi$_2$Se$_4$, in contrast to the Ising antiferromagnetic states in other magnetic topological insulators, might be relevant for hosting new topological states. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.01064v1-abstract-full').style.display = 'none'; document.getElementById('2406.01064v1-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, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2405.06041">arXiv:2405.06041</a> <span> [<a href="https://arxiv.org/pdf/2405.06041">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> <p class="title is-5 mathjax"> Gate Tunable Asymmetric Ozone Adsorption on Graphene </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Qi%2C+Z">Zhen Qi</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+W">Wanlei Li</a>, <a href="/search/cond-mat?searchtype=author&query=Cheng%2C+J">Jun Cheng</a>, <a href="/search/cond-mat?searchtype=author&query=Guo%2C+Z">Zhongxin Guo</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+C">Chenglong Li</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+S">Shang Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Tan%2C+Z">Zuoquan Tan</a>, <a href="/search/cond-mat?searchtype=author&query=Gao%2C+Z">Zhiting Gao</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Y">Yongchao Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Lian%2C+Z">Zichen Lian</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+S">Shanshan Chen</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yonglin He</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Z">Zhiyong Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Y">Yapei Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+J">Jinsong Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Y">Yayu Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Cai%2C+P">Peng Cai</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="2405.06041v1-abstract-short" style="display: inline;"> Molecular adsorption is pivotal in device fabrication and material synthesis for quantum technology. However, elucidating the behavior of physisorption poses technical challenges. Here graphene with ultrahigh sensitivity was utilized to detect ozone adsorption at cryogenic temperatures. Significant hole doping observed in graphene indicates a strong interaction between ozone and graphene. Interest… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.06041v1-abstract-full').style.display = 'inline'; document.getElementById('2405.06041v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2405.06041v1-abstract-full" style="display: none;"> Molecular adsorption is pivotal in device fabrication and material synthesis for quantum technology. However, elucidating the behavior of physisorption poses technical challenges. Here graphene with ultrahigh sensitivity was utilized to detect ozone adsorption at cryogenic temperatures. Significant hole doping observed in graphene indicates a strong interaction between ozone and graphene. Interestingly, the adsorption exhibits asymmetry with positive and negative gate voltages. The strong affinity of ozone provides a tool to modulate materials and devices, while the gate tunability of adsorption offers new insights into construction and manipulation of oxide quantum materials. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.06041v1-abstract-full').style.display = 'none'; document.getElementById('2405.06041v1-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 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2404.08745">arXiv:2404.08745</a> <span> [<a href="https://arxiv.org/pdf/2404.08745">pdf</a>, <a href="https://arxiv.org/format/2404.08745">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/10.1103/PhysRevLett.134.016503">10.1103/PhysRevLett.134.016503 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Extended Metal-Insulator Crossover with Strong Antiferromagnetic Spin Correlation in Half-Filled 3D Hubbard Model </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Song%2C+Y">Yu-Feng Song</a>, <a href="/search/cond-mat?searchtype=author&query=Deng%2C+Y">Youjin Deng</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yuan-Yao He</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="2404.08745v4-abstract-short" style="display: inline;"> The Hubbard model at temperatures above the N茅el transition, despite being a paramagnet, can exhibit rich physics due to the interplay of Fermi surface, on-site interaction $U$ and thermal fluctuations. Nevertheless, the understanding of the crossover physics remains only at a qualitative level, because of the intrinsically smooth behavior. Employing an improved variant of the {\it numerically exa… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.08745v4-abstract-full').style.display = 'inline'; document.getElementById('2404.08745v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2404.08745v4-abstract-full" style="display: none;"> The Hubbard model at temperatures above the N茅el transition, despite being a paramagnet, can exhibit rich physics due to the interplay of Fermi surface, on-site interaction $U$ and thermal fluctuations. Nevertheless, the understanding of the crossover physics remains only at a qualitative level, because of the intrinsically smooth behavior. Employing an improved variant of the {\it numerically exact} auxiliary-field quantum Monte Carlo algorithm equipped with numerical analytic continuation, we obtain a broad variety of thermodynamic and dynamical properties of the three-dimensional Hubbard model at half filling, quantitatively determine the crossover boundaries, and observe that the metal-insulator crossover regime, in which antiferromagnetic spin correlations appear strongest, exists over an extended regime in between the Fermi liquid for small $U$ and the Mott insulator for large $U$. In particular, the location of the most rapid suppression of double occupancy as $U$ increases, is found to fully reside in the metallic Fermi liquid regime, in contrast to the conventional intuition that it is a representative feature for entering the Mott insulator. Beside providing a reliable methodology for numerical study of crossover physics, our work can also serve as a timely and important guideline for the most recent optical lattice experiments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.08745v4-abstract-full').style.display = 'none'; document.getElementById('2404.08745v4-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 January, 2025; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 April, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 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">7 pages, 4 figures; Accepted by Phys. Rev. Lett</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 134, 016503 (2025) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.18683">arXiv:2403.18683</a> <span> [<a href="https://arxiv.org/pdf/2403.18683">pdf</a>, <a href="https://arxiv.org/format/2403.18683">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Other Condensed Matter">cond-mat.other</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"> Exploring the Berezinskii-Kosterlitz-Thouless Transition in a Two-dimensional Dipolar Bose Gas </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yifei He</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+Z">Ziting Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Zhen%2C+H">Haoting Zhen</a>, <a href="/search/cond-mat?searchtype=author&query=Huang%2C+M">Mingchen Huang</a>, <a href="/search/cond-mat?searchtype=author&query=Parit%2C+M+K">Mithilesh K Parit</a>, <a href="/search/cond-mat?searchtype=author&query=Jo%2C+G">Gyu-Boong Jo</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="2403.18683v1-abstract-short" style="display: inline;"> Long-range and anisotropic dipolar interactions induce complex order in quantum systems. It becomes particularly interesting in two-dimension (2D), where the superfluidity with quasi-long-range order emerges via Berezinskii-Kosterlitz-Thouless (BKT) mechanism, which still remains elusive with dipolar interactions. Here, we observe the BKT transition from a normal gas to the superfluid phase in a q… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.18683v1-abstract-full').style.display = 'inline'; document.getElementById('2403.18683v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.18683v1-abstract-full" style="display: none;"> Long-range and anisotropic dipolar interactions induce complex order in quantum systems. It becomes particularly interesting in two-dimension (2D), where the superfluidity with quasi-long-range order emerges via Berezinskii-Kosterlitz-Thouless (BKT) mechanism, which still remains elusive with dipolar interactions. Here, we observe the BKT transition from a normal gas to the superfluid phase in a quasi-2D dipolar Bose gas of erbium atoms. Controlling the orientation of dipoles, we characterize the transition point by monitoring extended coherence and measuring the equation of state. This allows us to gain a systematic understanding of the BKT transition based on an effective short-range description of dipolar interaction in 2D. Additionally, we observe anisotropic density fluctuations and non-local effects in the superfluid regime, which establishes the dipolar nature of the 2D superfluid. Our results lay the ground for understanding the behavior of dipolar bosons in 2D and open up opportunities for examining complex orders in a dipolar superfluid. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.18683v1-abstract-full').style.display = 'none'; document.getElementById('2403.18683v1-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 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">8 pages, 4 figues, supplementary information</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.09095">arXiv:2403.09095</a> <span> [<a href="https://arxiv.org/pdf/2403.09095">pdf</a>, <a href="https://arxiv.org/format/2403.09095">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Disordered Systems and Neural Networks">cond-mat.dis-nn</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</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/PRXQuantum.6.010325">10.1103/PRXQuantum.6.010325 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Exploring Hilbert-Space Fragmentation on a Superconducting Processor </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Y">Yong-Yi Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Shi%2C+Y">Yun-Hao Shi</a>, <a href="/search/cond-mat?searchtype=author&query=Sun%2C+Z">Zheng-Hang Sun</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+C">Chi-Tong Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Z">Zheng-An Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhao%2C+K">Kui Zhao</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+H">Hao-Tian Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Ma%2C+W">Wei-Guo Ma</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+Z">Ziting Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+H">Hao Li</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+J">Jia-Chi Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+Y">Yu Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Deng%2C+C">Cheng-Lin Deng</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+T">Tian-Ming Li</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yang He</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+Z">Zheng-He Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Peng%2C+Z">Zhen-Yu Peng</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+X">Xiaohui Song</a>, <a href="/search/cond-mat?searchtype=author&query=Xue%2C+G">Guangming Xue</a>, <a href="/search/cond-mat?searchtype=author&query=Yu%2C+H">Haifeng Yu</a>, <a href="/search/cond-mat?searchtype=author&query=Huang%2C+K">Kaixuan Huang</a>, <a href="/search/cond-mat?searchtype=author&query=Xiang%2C+Z">Zhongcheng Xiang</a>, <a href="/search/cond-mat?searchtype=author&query=Zheng%2C+D">Dongning Zheng</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+K">Kai Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Fan%2C+H">Heng Fan</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="2403.09095v1-abstract-short" style="display: inline;"> Isolated interacting quantum systems generally thermalize, yet there are several counterexamples for the breakdown of ergodicity, such as many-body localization and quantum scars. Recently, ergodicity breaking has been observed in systems subjected to linear potentials, termed Stark many-body localization. This phenomenon is closely associated with Hilbert-space fragmentation, characterized by a s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.09095v1-abstract-full').style.display = 'inline'; document.getElementById('2403.09095v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.09095v1-abstract-full" style="display: none;"> Isolated interacting quantum systems generally thermalize, yet there are several counterexamples for the breakdown of ergodicity, such as many-body localization and quantum scars. Recently, ergodicity breaking has been observed in systems subjected to linear potentials, termed Stark many-body localization. This phenomenon is closely associated with Hilbert-space fragmentation, characterized by a strong dependence of dynamics on initial conditions. Here, we experimentally explore initial-state dependent dynamics using a ladder-type superconducting processor with up to 24 qubits, which enables precise control of the qubit frequency and initial state preparation. In systems with linear potentials, we observe distinct non-equilibrium dynamics for initial states with the same quantum numbers and energy, but with varying domain wall numbers. This distinction becomes increasingly pronounced as the system size grows, in contrast with disordered interacting systems. Our results provide convincing experimental evidence of the fragmentation in Stark systems, enriching our understanding of the weak breakdown of ergodicity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.09095v1-abstract-full').style.display = 'none'; document.getElementById('2403.09095v1-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 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">main text: 7 pages, 4 figures; supplementary: 13 pages, 14 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> PRX Quantum 6, 010325 (2025) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.05127">arXiv:2403.05127</a> <span> [<a href="https://arxiv.org/pdf/2403.05127">pdf</a>, <a href="https://arxiv.org/format/2403.05127">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</span> </div> </div> <p class="title is-5 mathjax"> The Uhlmann Phase Winding in Bose-Einstein Condensates at Finite Temperature </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wang%2C+C">Chang-Yan Wang</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yan He</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="2403.05127v2-abstract-short" style="display: inline;"> We investigate the Uhlmann phase, a generalization of the celebrated Berry phase, for Bose-Einstein condensates (BECs) at finite temperature. The Uhlmann phase characterizes topological properties of mixed states, in contrast to the Berry phase which is defined for pure states at zero temperature. Using the $SU(1,1)$ symmetry of the Bogoliubov Hamiltonian, we derive a general formula for the Uhlma… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.05127v2-abstract-full').style.display = 'inline'; document.getElementById('2403.05127v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.05127v2-abstract-full" style="display: none;"> We investigate the Uhlmann phase, a generalization of the celebrated Berry phase, for Bose-Einstein condensates (BECs) at finite temperature. The Uhlmann phase characterizes topological properties of mixed states, in contrast to the Berry phase which is defined for pure states at zero temperature. Using the $SU(1,1)$ symmetry of the Bogoliubov Hamiltonian, we derive a general formula for the Uhlmann phase of BECs. Numerical calculations reveal that the Uhlmann phase can differ from the Berry phase in the zero-temperature limit, contrary to previous studies. As the temperature increases, the Uhlmann phase exhibits a winding behavior, and we relate the total winding degree to the Berry phase. This winding indicates that the Uhlmann phase takes values on a Riemann surface. Furthermore, we propose an experimental scheme to measure the Uhlmann phase of BECs by purifying the density matrix using an atomic interferometer. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.05127v2-abstract-full').style.display = 'none'; document.getElementById('2403.05127v2-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 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 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">11 pages,7 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/2403.04244">arXiv:2403.04244</a> <span> [<a href="https://arxiv.org/pdf/2403.04244">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"> Resonant Quantum Magnetodielectric Effect in Multiferroic Metal-Organic Framework [CH3NH3]Co(HCOO)3 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Su%2C+N">Na Su</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+S">Shuang Liu</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yingjie He</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+Y">Yan Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Fu%2C+H">Huixia Fu</a>, <a href="/search/cond-mat?searchtype=author&query=Chai%2C+Y">Yi-Sheng Chai</a>, <a href="/search/cond-mat?searchtype=author&query=Sun%2C+Y">Young Sun</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="2403.04244v1-abstract-short" style="display: inline;"> We report the observation of both resonant quantum tunneling of magnetization (RQTM) and resonant quantum magnetodielectric (RQMD) effect in the perovskite multiferroic metal-organic framework [CH3NH3]Co(HCOO)3. An intrinsic magnetic phase separation emerges at low temperatures due to hydrogen-bond-modified long range super-exchange interaction, leading to the coexistence of canted antiferromagnet… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.04244v1-abstract-full').style.display = 'inline'; document.getElementById('2403.04244v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.04244v1-abstract-full" style="display: none;"> We report the observation of both resonant quantum tunneling of magnetization (RQTM) and resonant quantum magnetodielectric (RQMD) effect in the perovskite multiferroic metal-organic framework [CH3NH3]Co(HCOO)3. An intrinsic magnetic phase separation emerges at low temperatures due to hydrogen-bond-modified long range super-exchange interaction, leading to the coexistence of canted antiferromagnetic order and single-ion magnet. Subsequently, a stair-shaped magnetic hysteresis loop along the [101] direction characterizing the RQTM appears below the magnetic blocking temperature. More interestingly, the magnetic field dependence of dielectric permittivity exhibits pronounced negative peaks at the critical fields corresponding to the RQTM, a phenomenon termed the RQMD effect which enables electrical detection of the RQTM. These intriguing properties make the multiferroic metal-organic framework a promising candidate for solid-state quantum computing. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.04244v1-abstract-full').style.display = 'none'; document.getElementById('2403.04244v1-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> 7 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">13 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/2403.00852">arXiv:2403.00852</a> <span> [<a href="https://arxiv.org/pdf/2403.00852">pdf</a>, <a href="https://arxiv.org/format/2403.00852">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</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="High Energy Physics - Theory">hep-th</span> </div> </div> <p class="title is-5 mathjax"> Reclaiming the Lost Conformality in a non-Hermitian Quantum 5-state Potts Model </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Tang%2C+Y">Yin Tang</a>, <a href="/search/cond-mat?searchtype=author&query=Ma%2C+H">Han Ma</a>, <a href="/search/cond-mat?searchtype=author&query=Tang%2C+Q">Qicheng Tang</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yin-Chen He</a>, <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+W">W. Zhu</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="2403.00852v2-abstract-short" style="display: inline;"> Conformal symmetry, emerging at critical points, can be lost when renormalization group fixed points collide. Recently, it was proposed that after collisions, real fixed points transition into the complex plane, becoming complex fixed points described by complex conformal field theories (CFTs). Although this idea is compelling, directly demonstrating such complex conformal fixed points in microsco… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.00852v2-abstract-full').style.display = 'inline'; document.getElementById('2403.00852v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.00852v2-abstract-full" style="display: none;"> Conformal symmetry, emerging at critical points, can be lost when renormalization group fixed points collide. Recently, it was proposed that after collisions, real fixed points transition into the complex plane, becoming complex fixed points described by complex conformal field theories (CFTs). Although this idea is compelling, directly demonstrating such complex conformal fixed points in microscopic models remains highly demanding. Furthermore, these concrete models are instrumental in unraveling the mysteries of complex CFTs and illuminating a variety of intriguing physical problems, including weakly first-order transitions in statistical mechanics and the conformal window of gauge theories. In this work, we have successfully addressed this complex challenge for the (1+1)-dimensional quantum $5$-state Potts model, whose phase transition has long been known to be weakly first-order. By adding an additional non-Hermitian interaction, we successfully identify two conjugate critical points located in the complex parameter space, where the lost conformality is restored in a complex manner. Specifically, we unambiguously demonstrate the radial quantization of the complex CFTs and compute the operator spectrum, as well as new operator product expansion coefficients that were previously unknown. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.00852v2-abstract-full').style.display = 'none'; document.getElementById('2403.00852v2-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 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 February, 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">6+13 pages</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2402.18779">arXiv:2402.18779</a> <span> [<a href="https://arxiv.org/pdf/2402.18779">pdf</a>, <a href="https://arxiv.org/format/2402.18779">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"> Nanoscale variation of the Rashba energy in BiTeI </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kang%2C+R">Ruizhe Kang</a>, <a href="/search/cond-mat?searchtype=author&query=Ge%2C+J">Jian-Feng Ge</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yang He</a>, <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+Z">Zhihuai Zhu</a>, <a href="/search/cond-mat?searchtype=author&query=Larson%2C+D+T">Daniel T. Larson</a>, <a href="/search/cond-mat?searchtype=author&query=Saghir%2C+M">Mohammed Saghir</a>, <a href="/search/cond-mat?searchtype=author&query=Hoffman%2C+J+D">Jason D. Hoffman</a>, <a href="/search/cond-mat?searchtype=author&query=Balakrishnan%2C+G">Geetha Balakrishnan</a>, <a href="/search/cond-mat?searchtype=author&query=Hoffman%2C+J+E">Jennifer E. Hoffman</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="2402.18779v2-abstract-short" style="display: inline;"> BiTeI is a polar semiconductor with strong spin-orbit coupling (SOC) that produces large Rashba spin splitting. Due to its potential utility in spintronics and magnetoelectrics, it is essential to understand how defects impact the spin transport in this material. Using scanning tunneling microscopy and spectroscopy, we image ring-like charging states of single-atom defects on the iodine surface of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.18779v2-abstract-full').style.display = 'inline'; document.getElementById('2402.18779v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2402.18779v2-abstract-full" style="display: none;"> BiTeI is a polar semiconductor with strong spin-orbit coupling (SOC) that produces large Rashba spin splitting. Due to its potential utility in spintronics and magnetoelectrics, it is essential to understand how defects impact the spin transport in this material. Using scanning tunneling microscopy and spectroscopy, we image ring-like charging states of single-atom defects on the iodine surface of BiTeI. We observe nanoscale variations in the Rashba energy around each defect, which we correlate with the local electric field extracted from the bias dependence of each ring radius. Our data demonstrate the local impact of atomic defects on the Rashba effect, which is both a challenge and an opportunity for the development of future nanoscale spintronic devices. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.18779v2-abstract-full').style.display = 'none'; document.getElementById('2402.18779v2-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 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 February, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2402.17266">arXiv:2402.17266</a> <span> [<a href="https://arxiv.org/pdf/2402.17266">pdf</a>, <a href="https://arxiv.org/ps/2402.17266">ps</a>, <a href="https://arxiv.org/format/2402.17266">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Disordered Systems and Neural Networks">cond-mat.dis-nn</span> </div> </div> <p class="title is-5 mathjax"> Mobility edges in non-Hermitian models with slowly varying quasi-periodic disorders </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Tang%2C+Q">Qiyun Tang</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yan He</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="2402.17266v1-abstract-short" style="display: inline;"> We investigate the appearance of mobility edges in a one-dimensional non-Hermitian tight-banding model with alternating hopping constants and slowly varying quasi-periodic on-site potentials. Due to the presence of slowly varying exponent, the parity-time (PT) symmetry of this model is broken and its spectra is complex. It is found that the spectrum of this model can be divided into three differen… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.17266v1-abstract-full').style.display = 'inline'; document.getElementById('2402.17266v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2402.17266v1-abstract-full" style="display: none;"> We investigate the appearance of mobility edges in a one-dimensional non-Hermitian tight-banding model with alternating hopping constants and slowly varying quasi-periodic on-site potentials. Due to the presence of slowly varying exponent, the parity-time (PT) symmetry of this model is broken and its spectra is complex. It is found that the spectrum of this model can be divided into three different types of patterns depending on the magnitude of the quasi-periodic potential. As the amplitude of the potential increases from small to large, the initially well defined mobility edges become blurred gradually and then eventually disappear for large enough potential. This behavior of the mobility edges is also confirmed by a detailed study of the winding number of the complex spectra of this non-Hermitian model. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.17266v1-abstract-full').style.display = 'none'; document.getElementById('2402.17266v1-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 February, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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">9 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 109, 224204 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2401.17362">arXiv:2401.17362</a> <span> [<a href="https://arxiv.org/pdf/2401.17362">pdf</a>, <a href="https://arxiv.org/format/2401.17362">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</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"> Entropic $F$-function of 3D Ising conformal field theory via the fuzzy sphere regularization </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Hu%2C+L">Liangdong Hu</a>, <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+W">W. Zhu</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yin-Chen He</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="2401.17362v1-abstract-short" style="display: inline;"> The $F$-function, the three-dimensional counterpart of the central charge in the 2D conformal field theory, measures the effective number of degrees of freedom in 3D quantum field theory, and it is monotonically decreasing under the renormalization group flow. However, unlike the 2D central charge, the $F$-function is a non-local quantity and cannot be computed using correlators of local operators… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.17362v1-abstract-full').style.display = 'inline'; document.getElementById('2401.17362v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2401.17362v1-abstract-full" style="display: none;"> The $F$-function, the three-dimensional counterpart of the central charge in the 2D conformal field theory, measures the effective number of degrees of freedom in 3D quantum field theory, and it is monotonically decreasing under the renormalization group flow. However, unlike the 2D central charge, the $F$-function is a non-local quantity and cannot be computed using correlators of local operators. Utilizing the recently proposed fuzzy sphere regularization, we have performed the first non-perturbative computation of the $F$-function for the paradigmatic 3D Ising conformal field theory through entanglement entropy. Our estimate yields $F_{\text{Ising}} \approx 0.0612(5)$, slightly smaller than the $F$-function of a real free scalar, $F_{\text{free}} = \frac{\log 2}{8} - \frac{3味(3)}{16蟺^2} \approx 0.0638$, consistent with the $F$-theorem, and close to the $4-蔚$ expansion estimates of $F_{\text{Ising}} \approx 0.0610 \sim 0.0623$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.17362v1-abstract-full').style.display = 'none'; document.getElementById('2401.17362v1-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, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 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">9 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/2401.10424">arXiv:2401.10424</a> <span> [<a href="https://arxiv.org/pdf/2401.10424">pdf</a>, <a href="https://arxiv.org/format/2401.10424">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> <p class="title is-5 mathjax"> Nanoscale Conducting and Insulating Domains on YbB$_6$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Coe%2C+A">Aaron Coe</a>, <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+Z">Zhi-Huai Zhu</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yang He</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+D">Dae-Jeong Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Fisk%2C+Z">Zachary Fisk</a>, <a href="/search/cond-mat?searchtype=author&query=Hoffman%2C+J">Jason Hoffman</a>, <a href="/search/cond-mat?searchtype=author&query=Hoffman%2C+J">Jennifer Hoffman</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="2401.10424v1-abstract-short" style="display: inline;"> YbB$_6$ is a predicted topological insulator, with experimental evidence for conducting surface states of yet-unproven origin. However, its lack of a natural cleavage plane, and resultant surface-dependent polarity, has obscured its study. We use scanning tunneling microscopy to image the cleaved surface of YbB$_6$, exhibiting several coexisting terminations with distinct atomic structures. Our sp… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.10424v1-abstract-full').style.display = 'inline'; document.getElementById('2401.10424v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2401.10424v1-abstract-full" style="display: none;"> YbB$_6$ is a predicted topological insulator, with experimental evidence for conducting surface states of yet-unproven origin. However, its lack of a natural cleavage plane, and resultant surface-dependent polarity, has obscured its study. We use scanning tunneling microscopy to image the cleaved surface of YbB$_6$, exhibiting several coexisting terminations with distinct atomic structures. Our spectroscopic measurements show band-bending between the terminations, resulting in both conducting and fully-gapped regions. In the conductive regions, we observe spectral peaks that are suggestive of van Hove singularities arising from Rashba spin-split quantum well states. The insulating regions rule out the possibility that YbB$_6$ is a strong topological insulator, while the spin-polarized conducting regions suggest possible utility for spintronic devices. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.10424v1-abstract-full').style.display = 'none'; document.getElementById('2401.10424v1-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 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 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">Submitted to Physical Review Letters</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2401.08754">arXiv:2401.08754</a> <span> [<a href="https://arxiv.org/pdf/2401.08754">pdf</a>, <a href="https://arxiv.org/format/2401.08754">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Gases">cond-mat.quant-gas</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/PhysRevLett.133.163403">10.1103/PhysRevLett.133.163403 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Floquet Flux Attachment in Cold Atomic Systems </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kamal%2C+H">Helia Kamal</a>, <a href="/search/cond-mat?searchtype=author&query=Kemp%2C+J">Jack Kemp</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yin-Chen He</a>, <a href="/search/cond-mat?searchtype=author&query=Fuji%2C+Y">Yohei Fuji</a>, <a href="/search/cond-mat?searchtype=author&query=Aidelsburger%2C+M">Monika Aidelsburger</a>, <a href="/search/cond-mat?searchtype=author&query=Zoller%2C+P">Peter Zoller</a>, <a href="/search/cond-mat?searchtype=author&query=Yao%2C+N+Y">Norman Y. Yao</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="2401.08754v2-abstract-short" style="display: inline;"> Flux attachment provides a powerful conceptual framework for understanding certain forms of topological order, including most notably the fractional quantum Hall effect. Despite its ubiquitous use as a theoretical tool, directly realizing flux attachment in a microscopic setting remains an open challenge. Here, we propose a simple approach to realizing flux attachment in a periodically-driven (Flo… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.08754v2-abstract-full').style.display = 'inline'; document.getElementById('2401.08754v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2401.08754v2-abstract-full" style="display: none;"> Flux attachment provides a powerful conceptual framework for understanding certain forms of topological order, including most notably the fractional quantum Hall effect. Despite its ubiquitous use as a theoretical tool, directly realizing flux attachment in a microscopic setting remains an open challenge. Here, we propose a simple approach to realizing flux attachment in a periodically-driven (Floquet) system of either spins or hard-core bosons. We demonstrate that such a system naturally realizes correlated hopping interactions and provides a sharp connection between such interactions and flux attachment. Starting with a simple, nearest-neighbor, free boson model, we find evidence -- from both a coupled wire analysis and large-scale density matrix renormalization group simulations -- that Floquet flux attachment stabilizes the bosonic integer quantum Hall state at $1/4$ filling (on a square lattice), and the Halperin-221 fractional quantum Hall state at $1/6$ filling (on a honeycomb lattice). At $1/2$ filling on the square lattice, time-reversal symmetry is instead spontaneously broken and bosonic integer quantum Hall states with opposite Hall conductances are degenerate. Finally, we propose an optical-lattice-based implementation of our model on a square lattice and discuss prospects for adiabatic preparation as well as effects of Floquet heating. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.08754v2-abstract-full').style.display = 'none'; document.getElementById('2401.08754v2-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">v1</span> submitted 16 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review Letters, 133(16), 163403 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2401.05954">arXiv:2401.05954</a> <span> [<a href="https://arxiv.org/pdf/2401.05954">pdf</a>, <a href="https://arxiv.org/ps/2401.05954">ps</a>, <a href="https://arxiv.org/format/2401.05954">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="Strongly Correlated Electrons">cond-mat.str-el</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/10.1088/1361-648X/ad64a0">10.1088/1361-648X/ad64a0 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Structure and scaling of Kitaev chain across a quantum critical point in real space </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yan He</a>, <a href="/search/cond-mat?searchtype=author&query=Chien%2C+C">Chih-Chun Chien</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="2401.05954v2-abstract-short" style="display: inline;"> The spatial Kibble-Zurek mechanism (KZM) is applied to the Kitaev chain with inhomogeneous pairing interactions that vanish in half of the lattice and result in a quantum critical point separating the superfluid and normal-gas phases in real space. The weakly-interacting BCS theory predicts scaling behavior of the penetration of the pair wavefunction into the normal-gas region different from conve… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.05954v2-abstract-full').style.display = 'inline'; document.getElementById('2401.05954v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2401.05954v2-abstract-full" style="display: none;"> The spatial Kibble-Zurek mechanism (KZM) is applied to the Kitaev chain with inhomogeneous pairing interactions that vanish in half of the lattice and result in a quantum critical point separating the superfluid and normal-gas phases in real space. The weakly-interacting BCS theory predicts scaling behavior of the penetration of the pair wavefunction into the normal-gas region different from conventional power-law results due to the non-analytic dependence of the BCS order parameter on the interaction. The Bogoliubov-de Gennes (BdG) equation produces numerical results confirming the scaling behavior and hints complications in the strong-interaction regime. The limiting case of the step-function quench shows the dominance of the BCS coherence length in absence of additional length scale. Furthermore, the energy spectrum and wavefunctions from the BdG equation show abundant in-gap states from the normal-gas region in addition to the topological edge states. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.05954v2-abstract-full').style.display = 'none'; document.getElementById('2401.05954v2-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 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 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">11 pages, 7 figures, submitted</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys.: Condens. Matter 36 425402 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2401.00039">arXiv:2401.00039</a> <span> [<a href="https://arxiv.org/pdf/2401.00039">pdf</a>, <a href="https://arxiv.org/format/2401.00039">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Theory">hep-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</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="High Energy Physics - Lattice">hep-lat</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/10.21468/SciPostPhys.17.1.021">10.21468/SciPostPhys.17.1.021 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The $g$-function and Defect Changing Operators from Wavefunction Overlap on a Fuzzy Sphere </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+Z">Zheng Zhou</a>, <a href="/search/cond-mat?searchtype=author&query=Gaiotto%2C+D">Davide Gaiotto</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yin-Chen He</a>, <a href="/search/cond-mat?searchtype=author&query=Zou%2C+Y">Yijian Zou</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="2401.00039v3-abstract-short" style="display: inline;"> Defects are common in physical systems with boundaries, impurities or extensive measurements. The interaction between bulk and defect can lead to rich physical phenomena. Defects in gapless phases of matter with conformal symmetry usually flow to a defect conformal field theory (dCFT). Understanding the universal properties of dCFTs is a challenging task. In this paper, we propose a computational… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.00039v3-abstract-full').style.display = 'inline'; document.getElementById('2401.00039v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2401.00039v3-abstract-full" style="display: none;"> Defects are common in physical systems with boundaries, impurities or extensive measurements. The interaction between bulk and defect can lead to rich physical phenomena. Defects in gapless phases of matter with conformal symmetry usually flow to a defect conformal field theory (dCFT). Understanding the universal properties of dCFTs is a challenging task. In this paper, we propose a computational strategy applicable to a line defect in arbitrary dimensions. Our main assumption is that the defect has a UV description in terms of a local modification of the Hamiltonian so that we can compute the overlap between low-energy eigenstates of a system with or without the defect insertion. We argue that these overlaps contain a wealth of conformal data, including the $g$-function, which is an RG monotonic quantity that distinguishes different dCFTs, the scaling dimensions of defect creation operators $螖^{+0}_伪$ and changing operators $螖^{+-}_伪$ that live on the intersection of different types of line defects, and various OPE coefficients. We apply this method to the fuzzy sphere regularization of 3D CFTs and study the magnetic line defect of the 3D Ising CFT. Using exact diagonalization and DMRG, we report the non-perturbative results $g=0.602(2),螖^{+0}_0=0.108(5)$ and $螖^{+-}_0=0.84(5)$ for the first time. We also obtain other OPE coefficients and scaling dimensions. Our results have significant physical implications. For example, they constrain the possible occurrence of spontaneous symmetry breaking at line defects of the 3D Ising CFT. Our method can be potentially applied to various other dCFTs, such as plane defects and Wilson lines in gauge theories. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.00039v3-abstract-full').style.display = 'none'; document.getElementById('2401.00039v3-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 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 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">30 pages, 10 figures and 6 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> SciPost Phys. 17, 021 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2312.16899">arXiv:2312.16899</a> <span> [<a href="https://arxiv.org/pdf/2312.16899">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"> Anomalous exchange bias effect in ferromagnetic VI3 flakes </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+X">Xi Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Xia%2C+X">Xiuquan Xia</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+Q">Qiye Liu</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yonggang He</a>, <a href="/search/cond-mat?searchtype=author&query=Wang%2C+L">Le Wang</a>, <a href="/search/cond-mat?searchtype=author&query=Lin%2C+J">Junhao Lin</a>, <a href="/search/cond-mat?searchtype=author&query=Mei%2C+J">Jia-Wei Mei</a>, <a href="/search/cond-mat?searchtype=author&query=Cheng%2C+Y">Yingchun Cheng</a>, <a href="/search/cond-mat?searchtype=author&query=Dai%2C+J">Jun-Feng Dai</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="2312.16899v1-abstract-short" style="display: inline;"> The exchange bias (EB) effect, pivotal in magnetic data storage and sensing devices, has been observed not only in interfacial regions but also in intrinsic ferromagnetic materials. Here, we've uncovered a robust and stable exchange bias effect within the layered van der Waals (vdW) ferromagnet VI3 employing magnetic circular dichroism microscopy. At 10 K, we observed a significant exchange field… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.16899v1-abstract-full').style.display = 'inline'; document.getElementById('2312.16899v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2312.16899v1-abstract-full" style="display: none;"> The exchange bias (EB) effect, pivotal in magnetic data storage and sensing devices, has been observed not only in interfacial regions but also in intrinsic ferromagnetic materials. Here, we've uncovered a robust and stable exchange bias effect within the layered van der Waals (vdW) ferromagnet VI3 employing magnetic circular dichroism microscopy. At 10 K, we observed a significant exchange field of approximately 0.1 T, accompanied by random shifts (positive or negative relative to zero magnetic field) after zero-field cooling. Notably, this effect is effectively controllable after field cooling, with shift direction opposing the applied magnetic field. The presence of strong magnetic anisotropic energy within VI3 results in larger coercivity-bound magnetic domains. These domains dictate the neighboring ferromagnetic alignment and induce shifts in the hysteresis loop. Our study not only contributes to comprehending fundamental nanoscale magnetic interactions but also sheds light on emergent phenomena within layered van der Waals magnets. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.16899v1-abstract-full').style.display = 'none'; document.getElementById('2312.16899v1-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 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2312.15899">arXiv:2312.15899</a> <span> [<a href="https://arxiv.org/pdf/2312.15899">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"> Corrosion-resistant aluminum alloy design through machine learning combined with high-throughput calculations </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Ji%2C+Y">Yucheng Ji</a>, <a href="/search/cond-mat?searchtype=author&query=Fu%2C+X">Xiaoqian Fu</a>, <a href="/search/cond-mat?searchtype=author&query=Ding%2C+F">Feng Ding</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+Y">Yongtao Xu</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yang He</a>, <a href="/search/cond-mat?searchtype=author&query=Ao%2C+M">Min Ao</a>, <a href="/search/cond-mat?searchtype=author&query=Xiao%2C+F">Fulai Xiao</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+D">Dihao Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Dey%2C+P">Poulumi Dey</a>, <a href="/search/cond-mat?searchtype=author&query=Xiao%2C+K">Kui Xiao</a>, <a href="/search/cond-mat?searchtype=author&query=Ren%2C+J">Jingli Ren</a>, <a href="/search/cond-mat?searchtype=author&query=Li%2C+X">Xiaogang Li</a>, <a href="/search/cond-mat?searchtype=author&query=Dong%2C+C">Chaofang Dong</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="2312.15899v1-abstract-short" style="display: inline;"> Efficiently designing lightweight alloys with combined high corrosion resistance and mechanical properties remains an enduring topic in materials engineering. To this end, machine learning (ML) coupled ab-initio calculations is proposed within this study. Due to the inadequate accuracy of conventional stress-strain ML models caused by corrosion factors, a novel reinforcement self-learning ML algor… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.15899v1-abstract-full').style.display = 'inline'; document.getElementById('2312.15899v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2312.15899v1-abstract-full" style="display: none;"> Efficiently designing lightweight alloys with combined high corrosion resistance and mechanical properties remains an enduring topic in materials engineering. To this end, machine learning (ML) coupled ab-initio calculations is proposed within this study. Due to the inadequate accuracy of conventional stress-strain ML models caused by corrosion factors, a novel reinforcement self-learning ML algorithm (accuracy R2 >0.92) is developed. Then, a strategy that integrates ML models, calculated energetics and mechanical moduli is implemented to optimize the Al alloys. Next, this Computation Designed Corrosion-Resistant Al alloy is fabricated that verified the simulation. The performance (elongation reaches ~30%) is attributed to the H-captured Al-Sc-Cu phases (-1.44 eV H-1) and Cu-modified 畏/畏' precipitation inside the grain boundaries (GBs). The developed Al-Mg-Zn-Cu interatomic potential (energy accuracy 6.50 meV atom-1) proves the cracking resistance of the GB region enhanced by Cu-modification. Conceptually, our strategy is of practical importance for designing new alloys exhibiting corrosion resistance and mechanical properties. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.15899v1-abstract-full').style.display = 'none'; document.getElementById('2312.15899v1-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 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2312.11732">arXiv:2312.11732</a> <span> [<a href="https://arxiv.org/pdf/2312.11732">pdf</a>, <a href="https://arxiv.org/format/2312.11732">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.109.045416">10.1103/PhysRevB.109.045416 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Two-Step Electronic Response to Magnetic Ordering in a van der Waals Ferromagnet </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wu%2C+H">Han Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+J">Jian-Xin Zhu</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+L">Lebing Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Butcher%2C+M+W">Matthew W Butcher</a>, <a href="/search/cond-mat?searchtype=author&query=Yue%2C+Z">Ziqin Yue</a>, <a href="/search/cond-mat?searchtype=author&query=Yuan%2C+D">Dongsheng Yuan</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yu He</a>, <a href="/search/cond-mat?searchtype=author&query=Oh%2C+J+S">Ji Seop Oh</a>, <a href="/search/cond-mat?searchtype=author&query=Huang%2C+J">Jianwei Huang</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+S">Shan Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Gong%2C+C">Cheng Gong</a>, <a href="/search/cond-mat?searchtype=author&query=Guo%2C+Y">Yucheng Guo</a>, <a href="/search/cond-mat?searchtype=author&query=Mo%2C+S">Sung-Kwan Mo</a>, <a href="/search/cond-mat?searchtype=author&query=Denlinger%2C+J+D">Jonathan D. Denlinger</a>, <a href="/search/cond-mat?searchtype=author&query=Lu%2C+D">Donghui Lu</a>, <a href="/search/cond-mat?searchtype=author&query=Hashimoto%2C+M">Makoto Hashimoto</a>, <a href="/search/cond-mat?searchtype=author&query=Stone%2C+M+B">Matthew B. Stone</a>, <a href="/search/cond-mat?searchtype=author&query=Kolesnikov%2C+A+I">Alexander I. Kolesnikov</a>, <a href="/search/cond-mat?searchtype=author&query=Chi%2C+S">Songxue Chi</a>, <a href="/search/cond-mat?searchtype=author&query=Kono%2C+J">Junichiro Kono</a>, <a href="/search/cond-mat?searchtype=author&query=Nevidomskyy%2C+A+H">Andriy H. Nevidomskyy</a>, <a href="/search/cond-mat?searchtype=author&query=Birgeneau%2C+R+J">Robert J. Birgeneau</a>, <a href="/search/cond-mat?searchtype=author&query=Dai%2C+P">Pengcheng Dai</a>, <a href="/search/cond-mat?searchtype=author&query=Yi%2C+M">Ming Yi</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="2312.11732v2-abstract-short" style="display: inline;"> The two-dimensional (2D) material Cr$_2$Ge$_2$Te$_6$ is a member of the class of insulating van der Waals magnets. Here, using high resolution angle-resolved photoemission spectroscopy in a detailed temperature dependence study, we identify a clear response of the electronic structure to a dimensional crossover in the form of two distinct temperature scales marking onsets of modifications in the e… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.11732v2-abstract-full').style.display = 'inline'; document.getElementById('2312.11732v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2312.11732v2-abstract-full" style="display: none;"> The two-dimensional (2D) material Cr$_2$Ge$_2$Te$_6$ is a member of the class of insulating van der Waals magnets. Here, using high resolution angle-resolved photoemission spectroscopy in a detailed temperature dependence study, we identify a clear response of the electronic structure to a dimensional crossover in the form of two distinct temperature scales marking onsets of modifications in the electronic structure. Specifically, we observe Te $p$-orbital-dominated bands to undergo changes at the Curie transition temperature T$_C$ while the Cr $d$-orbital-dominated bands begin evolving at a higher temperature scale. Combined with neutron scattering, density functional theory calculations, and Monte Carlo simulations, we find that the electronic system can be consistently understood to respond sequentially to the distinct temperatures at which in-plane and out-of-plane spin correlations exceed a characteristic length scale. Our findings reveal the sensitivity of the orbital-selective electronic structure for probing the dynamical evolution of local moment correlations in vdW insulating magnets. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.11732v2-abstract-full').style.display = 'none'; document.getElementById('2312.11732v2-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> 20 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 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">PRB, in press</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review B 109, 045416 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2312.11155">arXiv:2312.11155</a> <span> [<a href="https://arxiv.org/pdf/2312.11155">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> </div> </div> <p class="title is-5 mathjax"> Possible manifestation of topological superconductivity and Majorana bound states in the microwave response of thin FeSe1-xTex film </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Cherpak%2C+N+T">N. T. Cherpak</a>, <a href="/search/cond-mat?searchtype=author&query=Barannik%2C+A+A">A. A. Barannik</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y+-">Y. -S. He</a>, <a href="/search/cond-mat?searchtype=author&query=Sun%2C+L">L. Sun</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+Y">Y. Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Melnyk%2C+S+I">S. I. Melnyk</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="2312.11155v1-abstract-short" style="display: inline;"> The paper analyzes the characteristics of the microwave (MW) response of FeSe1-xTex films based on the results of measuring the impedance properties of the films in the X-band for two orientations of the film in the MW magnetic field, perpendicular and parallel. The analysis of the temperature dependence of the microwave response of a film with a perpendicular orientation (in which the peculiarity… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.11155v1-abstract-full').style.display = 'inline'; document.getElementById('2312.11155v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2312.11155v1-abstract-full" style="display: none;"> The paper analyzes the characteristics of the microwave (MW) response of FeSe1-xTex films based on the results of measuring the impedance properties of the films in the X-band for two orientations of the film in the MW magnetic field, perpendicular and parallel. The analysis of the temperature dependence of the microwave response of a film with a perpendicular orientation (in which the peculiarity of the response is manifested) was carried out by means of physical considerations, taking into account also the results of the research of this superconductor by other authors using the ARPES technique and tunneling spectroscopy. It was concluded that with perpendicular orientation, two competing mechanisms of MW energy dissipation in the film can occur, one of which leads to the increase in energy dissipation caused by magnetic vortices with an MW field, and the other to its decrease due to the emergence of Majorana bound states with zero energy <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.11155v1-abstract-full').style.display = 'none'; document.getElementById('2312.11155v1-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 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2312.05233">arXiv:2312.05233</a> <span> [<a href="https://arxiv.org/pdf/2312.05233">pdf</a>, <a href="https://arxiv.org/format/2312.05233">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> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-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/10.1021/acs.jctc.3c01343">10.1021/acs.jctc.3c01343 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Tensorial properties via the neuroevolution potential framework: Fast simulation of infrared and Raman spectra </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Xu%2C+N">Nan Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Rosander%2C+P">Petter Rosander</a>, <a href="/search/cond-mat?searchtype=author&query=Sch%C3%A4fer%2C+C">Christian Sch盲fer</a>, <a href="/search/cond-mat?searchtype=author&query=Lindgren%2C+E">Eric Lindgren</a>, <a href="/search/cond-mat?searchtype=author&query=%C3%96sterbacka%2C+N">Nicklas 脰sterbacka</a>, <a href="/search/cond-mat?searchtype=author&query=Fang%2C+M">Mandi Fang</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+W">Wei Chen</a>, <a href="/search/cond-mat?searchtype=author&query=He%2C+Y">Yi He</a>, <a href="/search/cond-mat?searchtype=author&query=Fan%2C+Z">Zheyong Fan</a>, <a href="/search/cond-mat?searchtype=author&query=Erhart%2C+P">Paul Erhart</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="2312.05233v2-abstract-short" style="display: inline;"> Infrared and Raman spectroscopy are widely used for the characterization of gases, liquids, and solids, as the spectra contain a wealth of information concerning in particular the dynamics of these systems. Atomic scale simulations can be used to predict such spectra but are often severely limited due to high computational cost or the need for strong approximations that limit application range and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.05233v2-abstract-full').style.display = 'inline'; document.getElementById('2312.05233v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2312.05233v2-abstract-full" style="display: none;"> Infrared and Raman spectroscopy are widely used for the characterization of gases, liquids, and solids, as the spectra contain a wealth of information concerning in particular the dynamics of these systems. Atomic scale simulations can be used to predict such spectra but are often severely limited due to high computational cost or the need for strong approximations that limit application range and reliability. Here, we introduce a machine learning (ML) accelerated approach that addresses these shortcomings and provides a significant performance boost in terms of data and computational efficiency compared to earlier ML schemes. To this end, we generalize the neuroevolution potential approach to enable the prediction of rank one and two tensors to obtain the tensorial neuroevolution potential (TNEP) scheme. We apply the resulting framework to construct models for the dipole moment, polarizability, and susceptibility of molecules, liquids, and solids, and show that our approach compares favorably with several ML models from the literature with respect to accuracy and computational efficiency. Finally, we demonstrate the application of the TNEP approach to the prediction of infrared and Raman spectra of liquid water, a molecule (PTAF-), and a prototypical perovskite with strong anharmonicity (BaZrO3). The TNEP approach is implemented in the free and open source software package GPUMD, which makes this methodology readily available to the scientific community. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.05233v2-abstract-full').style.display = 'none'; document.getElementById('2312.05233v2-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 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 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">11 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Journal of Chemical Theory and Computation 20, 3273 (2024) </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=He%2C+Y&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=He%2C+Y&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=He%2C+Y&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> <li> <a href="/search/?searchtype=author&query=He%2C+Y&start=100" class="pagination-link " aria-label="Page 3" aria-current="page">3 </a> </li> <li> <a href="/search/?searchtype=author&query=He%2C+Y&start=150" class="pagination-link " aria-label="Page 4" aria-current="page">4 </a> </li> <li> <a 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