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</div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <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/2402.10932">arXiv:2402.10932</a> <span> [<a href="https://arxiv.org/pdf/2402.10932">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="Data Analysis, Statistics and Probability">physics.data-an</span> </div> </div> <p class="title is-5 mathjax"> Roadmap on Data-Centric Materials Science </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Bauer%2C+S">Stefan Bauer</a>, <a href="/search/physics?searchtype=author&query=Benner%2C+P">Peter Benner</a>, <a href="/search/physics?searchtype=author&query=Bereau%2C+T">Tristan Bereau</a>, <a href="/search/physics?searchtype=author&query=Blum%2C+V">Volker Blum</a>, <a href="/search/physics?searchtype=author&query=Boley%2C+M">Mario Boley</a>, <a href="/search/physics?searchtype=author&query=Carbogno%2C+C">Christian Carbogno</a>, <a href="/search/physics?searchtype=author&query=Catlow%2C+C+R+A">C. Richard A. Catlow</a>, <a href="/search/physics?searchtype=author&query=Dehm%2C+G">Gerhard Dehm</a>, <a href="/search/physics?searchtype=author&query=Eibl%2C+S">Sebastian Eibl</a>, <a href="/search/physics?searchtype=author&query=Ernstorfer%2C+R">Ralph Ernstorfer</a>, <a href="/search/physics?searchtype=author&query=Fekete%2C+%C3%81">脕d谩m Fekete</a>, <a href="/search/physics?searchtype=author&query=Foppa%2C+L">Lucas Foppa</a>, <a href="/search/physics?searchtype=author&query=Fratzl%2C+P">Peter Fratzl</a>, <a href="/search/physics?searchtype=author&query=Freysoldt%2C+C">Christoph Freysoldt</a>, <a href="/search/physics?searchtype=author&query=Gault%2C+B">Baptiste Gault</a>, <a href="/search/physics?searchtype=author&query=Ghiringhelli%2C+L+M">Luca M. Ghiringhelli</a>, <a href="/search/physics?searchtype=author&query=Giri%2C+S+K">Sajal K. Giri</a>, <a href="/search/physics?searchtype=author&query=Gladyshev%2C+A">Anton Gladyshev</a>, <a href="/search/physics?searchtype=author&query=Goyal%2C+P">Pawan Goyal</a>, <a href="/search/physics?searchtype=author&query=Hattrick-Simpers%2C+J">Jason Hattrick-Simpers</a>, <a href="/search/physics?searchtype=author&query=Kabalan%2C+L">Lara Kabalan</a>, <a href="/search/physics?searchtype=author&query=Karpov%2C+P">Petr Karpov</a>, <a href="/search/physics?searchtype=author&query=Khorrami%2C+M+S">Mohammad S. Khorrami</a>, <a href="/search/physics?searchtype=author&query=Koch%2C+C">Christoph Koch</a>, <a href="/search/physics?searchtype=author&query=Kokott%2C+S">Sebastian Kokott</a> , et al. (36 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="2402.10932v3-abstract-short" style="display: inline;"> Science is and always has been based on data, but the terms "data-centric" and the "4th paradigm of" materials research indicate a radical change in how information is retrieved, handled and research is performed. It signifies a transformative shift towards managing vast data collections, digital repositories, and innovative data analytics methods. The integration of Artificial Intelligence (AI) a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.10932v3-abstract-full').style.display = 'inline'; document.getElementById('2402.10932v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2402.10932v3-abstract-full" style="display: none;"> Science is and always has been based on data, but the terms "data-centric" and the "4th paradigm of" materials research indicate a radical change in how information is retrieved, handled and research is performed. It signifies a transformative shift towards managing vast data collections, digital repositories, and innovative data analytics methods. The integration of Artificial Intelligence (AI) and its subset Machine Learning (ML), has become pivotal in addressing all these challenges. This Roadmap on Data-Centric Materials Science explores fundamental concepts and methodologies, illustrating diverse applications in electronic-structure theory, soft matter theory, microstructure research, and experimental techniques like photoemission, atom probe tomography, and electron microscopy. While the roadmap delves into specific areas within the broad interdisciplinary field of materials science, the provided examples elucidate key concepts applicable to a wider range of topics. The discussed instances offer insights into addressing the multifaceted challenges encountered in contemporary materials research. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.10932v3-abstract-full').style.display = 'none'; document.getElementById('2402.10932v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 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">Review, outlook, roadmap, perspective</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2110.06538">arXiv:2110.06538</a> <span> [<a href="https://arxiv.org/pdf/2110.06538">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> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</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/PhysRevX.11.041060">10.1103/PhysRevX.11.041060 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Probing the energy conversion pathways between light, carriers and lattice in real time with attosecond core-level spectroscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Sidiropoulos%2C+T+P+H">T. P. H. Sidiropoulos</a>, <a href="/search/physics?searchtype=author&query=Di+Palo%2C+N">N. Di Palo</a>, <a href="/search/physics?searchtype=author&query=Rivas%2C+D+E">D. E. Rivas</a>, <a href="/search/physics?searchtype=author&query=Severino%2C+S">S. Severino</a>, <a href="/search/physics?searchtype=author&query=Reduzzi%2C+M">M. Reduzzi</a>, <a href="/search/physics?searchtype=author&query=Nandy%2C+B">B. Nandy</a>, <a href="/search/physics?searchtype=author&query=Bauerhenne%2C+B">B. Bauerhenne</a>, <a href="/search/physics?searchtype=author&query=Krylow%2C+S">S. Krylow</a>, <a href="/search/physics?searchtype=author&query=Vasileiadis%2C+T">T. Vasileiadis</a>, <a href="/search/physics?searchtype=author&query=Danz%2C+T">T. Danz</a>, <a href="/search/physics?searchtype=author&query=Elliott%2C+P">P. Elliott</a>, <a href="/search/physics?searchtype=author&query=Sharma%2C+S">S. Sharma</a>, <a href="/search/physics?searchtype=author&query=Dewhurst%2C+K">K. Dewhurst</a>, <a href="/search/physics?searchtype=author&query=Ropers%2C+C">C. Ropers</a>, <a href="/search/physics?searchtype=author&query=Joly%2C+Y">Y. Joly</a>, <a href="/search/physics?searchtype=author&query=Garcia%2C+K+M+E">K. M. E. Garcia</a>, <a href="/search/physics?searchtype=author&query=Wolf%2C+M">M. Wolf</a>, <a href="/search/physics?searchtype=author&query=Ernstorfer%2C+R">R. Ernstorfer</a>, <a href="/search/physics?searchtype=author&query=Biegert%2C+J">J. Biegert</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2110.06538v1-abstract-short" style="display: inline;"> Detection of the energy conversion pathways, between photons, charge carriers, and the lattice is of fundamental importance to understand fundamental physics and to advance materials and devices. Yet, such insight remains incomplete due to experimental challenges in disentangling the various signatures on overlapping time scales. Here, we show that attosecond core-level X-ray spectroscopy can iden… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.06538v1-abstract-full').style.display = 'inline'; document.getElementById('2110.06538v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2110.06538v1-abstract-full" style="display: none;"> Detection of the energy conversion pathways, between photons, charge carriers, and the lattice is of fundamental importance to understand fundamental physics and to advance materials and devices. Yet, such insight remains incomplete due to experimental challenges in disentangling the various signatures on overlapping time scales. Here, we show that attosecond core-level X-ray spectroscopy can identify these interactions with attosecond precision and across a picosecond range. We demonstrate this methodology on graphite since its investigation is complicated by a variety of mechanisms occurring across a wide range of temporal scales. Our methodology reveals, through the simultaneous real-time detection of electrons and holes, the different dephasing mechanisms for each carrier type dependent on excitation with few-cycle-duration light fields. These results demonstrate the general ability of our methodology to detect and distinguish the various dynamic contributions to the flow of energy inside materials on their native time scales. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2110.06538v1-abstract-full').style.display = 'none'; document.getElementById('2110.06538v1-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 October, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2102.05604">arXiv:2102.05604</a> <span> [<a href="https://arxiv.org/pdf/2102.05604">pdf</a>, <a href="https://arxiv.org/format/2102.05604">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Data Analysis, Statistics and Probability">physics.data-an</span> </div> </div> <p class="title is-5 mathjax"> Scalable multicomponent spectral analysis for high-throughput data annotation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Xian%2C+R+P">Rui Patrick Xian</a>, <a href="/search/physics?searchtype=author&query=Ernstorfer%2C+R">Ralph Ernstorfer</a>, <a href="/search/physics?searchtype=author&query=Pelz%2C+P+M">Philipp Michael Pelz</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="2102.05604v2-abstract-short" style="display: inline;"> Orchestrating parametric fitting of multicomponent spectra at scale is an essential yet underappreciated task in high-throughput quantification of materials and chemical composition. To automate the annotation process for spectroscopic and diffraction data collected in counts of hundreds to thousands, we present a systematic approach compatible with high-performance computing infrastructures using… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2102.05604v2-abstract-full').style.display = 'inline'; document.getElementById('2102.05604v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2102.05604v2-abstract-full" style="display: none;"> Orchestrating parametric fitting of multicomponent spectra at scale is an essential yet underappreciated task in high-throughput quantification of materials and chemical composition. To automate the annotation process for spectroscopic and diffraction data collected in counts of hundreds to thousands, we present a systematic approach compatible with high-performance computing infrastructures using the MapReduce model and task-based parallelization. We implement the approach in software and demonstrate linear computational scaling with respect to spectral components using multidimensional experimental materials characterization datasets from photoemission spectroscopy and powder electron diffraction as benchmarks. Our approach enables efficient generation of high-quality data annotation and online spectral analysis and is applicable to a variety of analytical techniques in materials science and chemistry as a building block for closed-loop experimental systems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2102.05604v2-abstract-full').style.display = 'none'; document.getElementById('2102.05604v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 March, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 February, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2011.12016">arXiv:2011.12016</a> <span> [<a href="https://arxiv.org/pdf/2011.12016">pdf</a>, <a href="https://arxiv.org/format/2011.12016">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link 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="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1126/sciadv.abg0869">10.1126/sciadv.abg0869 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Nuclear dynamics of singlet exciton fission: a direct observation in pentacene single crystals </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Seiler%2C+H">H茅l猫ne Seiler</a>, <a href="/search/physics?searchtype=author&query=Krynski%2C+M">Marcin Krynski</a>, <a href="/search/physics?searchtype=author&query=Zahn%2C+D">Daniela Zahn</a>, <a href="/search/physics?searchtype=author&query=Hammer%2C+S">Sebastian Hammer</a>, <a href="/search/physics?searchtype=author&query=Windsor%2C+Y+W">Yoav William Windsor</a>, <a href="/search/physics?searchtype=author&query=Vasileiadis%2C+T">Thomas Vasileiadis</a>, <a href="/search/physics?searchtype=author&query=Pflaum%2C+J">Jens Pflaum</a>, <a href="/search/physics?searchtype=author&query=Ernstorfer%2C+R">Ralph Ernstorfer</a>, <a href="/search/physics?searchtype=author&query=Rossi%2C+M">Mariana Rossi</a>, <a href="/search/physics?searchtype=author&query=Schwoerer%2C+H">Heinrich Schwoerer</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2011.12016v1-abstract-short" style="display: inline;"> Singlet exciton fission (SEF) is a key process in the development of efficient opto-electronic devices. An aspect that is rarely probed directly, and yet has a tremendous impact on SEF properties, is the nuclear structure and dynamics involved in this process. Here we directly observe the nuclear dynamics accompanying the SEF process in single crystal pentacene using femtosecond electron diffracti… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.12016v1-abstract-full').style.display = 'inline'; document.getElementById('2011.12016v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2011.12016v1-abstract-full" style="display: none;"> Singlet exciton fission (SEF) is a key process in the development of efficient opto-electronic devices. An aspect that is rarely probed directly, and yet has a tremendous impact on SEF properties, is the nuclear structure and dynamics involved in this process. Here we directly observe the nuclear dynamics accompanying the SEF process in single crystal pentacene using femtosecond electron diffraction. The data reveal coherent atomic motions at 1 THz, incoherent motions, and an anisotropic lattice distortion representing the polaronic character of the triplet excitons. Combining molecular dynamics simulations, time-dependent density functional theory and experimental structure factor analysis, the coherent motions are identified as collective sliding motions of the pentacene molecules along their long axis. Such motions modify the excitonic coupling between adjacent molecules. Our findings reveal that long-range motions play a decisive part in the disintegration of the electronically correlated triplet pairs, and shed light on why SEF occurs on ultrafast timescales. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.12016v1-abstract-full').style.display = 'none'; document.getElementById('2011.12016v1-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> 24 November, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2020. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2008.05829">arXiv:2008.05829</a> <span> [<a href="https://arxiv.org/pdf/2008.05829">pdf</a>, <a href="https://arxiv.org/format/2008.05829">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/5.0024493">10.1063/5.0024493 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A quantitative comparison of time-of-flight momentum microscopes and hemispherical analyzers for time- and angle-resolved photoemission spectroscopy experiments </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Maklar%2C+J">J. Maklar</a>, <a href="/search/physics?searchtype=author&query=Dong%2C+S">S. Dong</a>, <a href="/search/physics?searchtype=author&query=Beaulieu%2C+S">S. Beaulieu</a>, <a href="/search/physics?searchtype=author&query=Pincelli%2C+T">T. Pincelli</a>, <a href="/search/physics?searchtype=author&query=Dendzik%2C+M">M. Dendzik</a>, <a href="/search/physics?searchtype=author&query=Windsor%2C+Y+W">Y. W. Windsor</a>, <a href="/search/physics?searchtype=author&query=Xian%2C+R+P">R. P. Xian</a>, <a href="/search/physics?searchtype=author&query=Wolf%2C+M">M. Wolf</a>, <a href="/search/physics?searchtype=author&query=Ernstorfer%2C+R">R. Ernstorfer</a>, <a href="/search/physics?searchtype=author&query=Rettig%2C+L">L. Rettig</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="2008.05829v2-abstract-short" style="display: inline;"> Time-of-flight-based momentum microscopy has a growing presence in photoemission studies, as it enables parallel energy- and momentum-resolved acquisition of the full photoelectron distribution. Here, we report table-top extreme ultraviolet (XUV) time- and angle-resolved photoemission spectroscopy (trARPES) featuring both a hemispherical analyzer and a momentum microscope within the same setup. We… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2008.05829v2-abstract-full').style.display = 'inline'; document.getElementById('2008.05829v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2008.05829v2-abstract-full" style="display: none;"> Time-of-flight-based momentum microscopy has a growing presence in photoemission studies, as it enables parallel energy- and momentum-resolved acquisition of the full photoelectron distribution. Here, we report table-top extreme ultraviolet (XUV) time- and angle-resolved photoemission spectroscopy (trARPES) featuring both a hemispherical analyzer and a momentum microscope within the same setup. We present a systematic comparison of the two detection schemes and quantify experimentally relevant parameters, including pump- and probe-induced space-charge effects, detection efficiency, photoelectron count rates, and depth of focus. We highlight the advantages and limitations of both instruments based on exemplary trARPES measurements of bulk WSe2. Our analysis demonstrates the complementary nature of the two spectrometers for time-resolved ARPES experiments. Their combination in a single experimental apparatus allows us to address a broad range of scientific questions with trARPES. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2008.05829v2-abstract-full').style.display = 'none'; document.getElementById('2008.05829v2-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 December, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 13 August, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">19 pages, 9 figures. The following article has been submitted to Review of Scientific Instruments / AIP Publishing. After it is published, it will be found at https://aip.scitation.org/journal/rsi</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2005.10210">arXiv:2005.10210</a> <span> [<a href="https://arxiv.org/pdf/2005.10210">pdf</a>, <a href="https://arxiv.org/format/2005.10210">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Data Analysis, Statistics and Probability">physics.data-an</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="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/10.1038/s43588-022-00382-2">10.1038/s43588-022-00382-2 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A machine learning route between band mapping and band structure </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Xian%2C+R+P">Rui Patrick Xian</a>, <a href="/search/physics?searchtype=author&query=Stimper%2C+V">Vincent Stimper</a>, <a href="/search/physics?searchtype=author&query=Zacharias%2C+M">Marios Zacharias</a>, <a href="/search/physics?searchtype=author&query=Dendzik%2C+M">Maciej Dendzik</a>, <a href="/search/physics?searchtype=author&query=Dong%2C+S">Shuo Dong</a>, <a href="/search/physics?searchtype=author&query=Beaulieu%2C+S">Samuel Beaulieu</a>, <a href="/search/physics?searchtype=author&query=Sch%C3%B6lkopf%2C+B">Bernhard Sch枚lkopf</a>, <a href="/search/physics?searchtype=author&query=Wolf%2C+M">Martin Wolf</a>, <a href="/search/physics?searchtype=author&query=Rettig%2C+L">Laurenz Rettig</a>, <a href="/search/physics?searchtype=author&query=Carbogno%2C+C">Christian Carbogno</a>, <a href="/search/physics?searchtype=author&query=Bauer%2C+S">Stefan Bauer</a>, <a href="/search/physics?searchtype=author&query=Ernstorfer%2C+R">Ralph Ernstorfer</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2005.10210v2-abstract-short" style="display: inline;"> Electronic band structure (BS) and crystal structure are the two complementary identifiers of solid state materials. While convenient instruments and reconstruction algorithms have made large, empirical, crystal structure databases possible, extracting quasiparticle dispersion (closely related to BS) from photoemission band mapping data is currently limited by the available computational methods.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.10210v2-abstract-full').style.display = 'inline'; document.getElementById('2005.10210v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2005.10210v2-abstract-full" style="display: none;"> Electronic band structure (BS) and crystal structure are the two complementary identifiers of solid state materials. While convenient instruments and reconstruction algorithms have made large, empirical, crystal structure databases possible, extracting quasiparticle dispersion (closely related to BS) from photoemission band mapping data is currently limited by the available computational methods. To cope with the growing size and scale of photoemission data, we develop a pipeline including probabilistic machine learning and the associated data processing, optimization and evaluation methods for band structure reconstruction, leveraging theoretical calculations. The pipeline reconstructs all 14 valence bands of a semiconductor and shows excellent performance on benchmarks and other materials datasets. The reconstruction uncovers previously inaccessible momentum-space structural information on both global and local scales, while realizing a path towards integration with materials science databases. Our approach illustrates the potential of combining machine learning and domain knowledge for scalable feature extraction in multidimensional data. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.10210v2-abstract-full').style.display = 'none'; document.getElementById('2005.10210v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2020. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1909.07714">arXiv:1909.07714</a> <span> [<a href="https://arxiv.org/pdf/1909.07714">pdf</a>, <a href="https://arxiv.org/format/1909.07714">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Data Analysis, Statistics and Probability">physics.data-an</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41597-020-00769-8">10.1038/s41597-020-00769-8 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> An open-source, end-to-end workflow for multidimensional photoemission spectroscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Xian%2C+R+P">Rui Patrick Xian</a>, <a href="/search/physics?searchtype=author&query=Acremann%2C+Y">Yves Acremann</a>, <a href="/search/physics?searchtype=author&query=Agustsson%2C+S+Y">Steinn Ymir Agustsson</a>, <a href="/search/physics?searchtype=author&query=Dendzik%2C+M">Maciej Dendzik</a>, <a href="/search/physics?searchtype=author&query=B%C3%BChlmann%2C+K">Kevin B眉hlmann</a>, <a href="/search/physics?searchtype=author&query=Curcio%2C+D">Davide Curcio</a>, <a href="/search/physics?searchtype=author&query=Kutnyakhov%2C+D">Dmytro Kutnyakhov</a>, <a href="/search/physics?searchtype=author&query=Pressacco%2C+F">Frederico Pressacco</a>, <a href="/search/physics?searchtype=author&query=Heber%2C+M">Michael Heber</a>, <a href="/search/physics?searchtype=author&query=Dong%2C+S">Shuo Dong</a>, <a href="/search/physics?searchtype=author&query=Pincelli%2C+T">Tommaso Pincelli</a>, <a href="/search/physics?searchtype=author&query=Demsar%2C+J">Jure Demsar</a>, <a href="/search/physics?searchtype=author&query=Wurth%2C+W">Wilfried Wurth</a>, <a href="/search/physics?searchtype=author&query=Hofmann%2C+P">Philip Hofmann</a>, <a href="/search/physics?searchtype=author&query=Wolf%2C+M">Martin Wolf</a>, <a href="/search/physics?searchtype=author&query=Scheidgen%2C+M">Markus Scheidgen</a>, <a href="/search/physics?searchtype=author&query=Rettig%2C+L">Laurenz Rettig</a>, <a href="/search/physics?searchtype=author&query=Ernstorfer%2C+R">Ralph Ernstorfer</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1909.07714v3-abstract-short" style="display: inline;"> Characterization of the electronic band structure of solid state materials is routinely performed using photoemission spectroscopy. Recent advancements in short-wavelength light sources and electron detectors give rise to multidimensional photoemission spectroscopy, allowing parallel measurements of the electron spectral function simultaneously in energy, two momentum components and additional phy… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.07714v3-abstract-full').style.display = 'inline'; document.getElementById('1909.07714v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1909.07714v3-abstract-full" style="display: none;"> Characterization of the electronic band structure of solid state materials is routinely performed using photoemission spectroscopy. Recent advancements in short-wavelength light sources and electron detectors give rise to multidimensional photoemission spectroscopy, allowing parallel measurements of the electron spectral function simultaneously in energy, two momentum components and additional physical parameters with single-event detection capability. Efficient processing of the photoelectron event streams at a rate of up to tens of megabytes per second will enable rapid band mapping for materials characterization. We describe an open-source workflow that allows user interaction with billion-count single-electron events in photoemission band mapping experiments, compatible with beamlines at $3^{\text{rd}}$ and $4^{\text{th}}$ generation light sources and table-top laser-based setups. The workflow offers an end-to-end recipe from distributed operations on single-event data to structured formats for downstream scientific tasks and storage to materials science database integration. Both the workflow and processed data can be archived for reuse, providing the infrastructure for documenting the provenance and lineage of photoemission data for future high-throughput experiments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1909.07714v3-abstract-full').style.display = 'none'; document.getElementById('1909.07714v3-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, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 September, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1906.11355">arXiv:1906.11355</a> <span> [<a href="https://arxiv.org/pdf/1906.11355">pdf</a>, <a href="https://arxiv.org/format/1906.11355">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Image and Video Processing">eess.IV</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Data Analysis, Statistics and Probability">physics.data-an</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantitative Methods">q-bio.QM</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/10.1109/ACCESS.2019.2952899">10.1109/ACCESS.2019.2952899 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Multidimensional Contrast Limited Adaptive Histogram Equalization </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Stimper%2C+V">Vincent Stimper</a>, <a href="/search/physics?searchtype=author&query=Bauer%2C+S">Stefan Bauer</a>, <a href="/search/physics?searchtype=author&query=Ernstorfer%2C+R">Ralph Ernstorfer</a>, <a href="/search/physics?searchtype=author&query=Sch%C3%B6lkopf%2C+B">Bernhard Sch枚lkopf</a>, <a href="/search/physics?searchtype=author&query=Xian%2C+R+P">R. Patrick Xian</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="1906.11355v3-abstract-short" style="display: inline;"> Contrast enhancement is an important preprocessing technique for improving the performance of downstream tasks in image processing and computer vision. Among the existing approaches based on nonlinear histogram transformations, contrast limited adaptive histogram equalization (CLAHE) is a popular choice for dealing with 2D images obtained in natural and scientific settings. The recent hardware upg… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1906.11355v3-abstract-full').style.display = 'inline'; document.getElementById('1906.11355v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1906.11355v3-abstract-full" style="display: none;"> Contrast enhancement is an important preprocessing technique for improving the performance of downstream tasks in image processing and computer vision. Among the existing approaches based on nonlinear histogram transformations, contrast limited adaptive histogram equalization (CLAHE) is a popular choice for dealing with 2D images obtained in natural and scientific settings. The recent hardware upgrade in data acquisition systems results in significant increase in data complexity, including their sizes and dimensions. Measurements of densely sampled data higher than three dimensions, usually composed of 3D data as a function of external parameters, are becoming commonplace in various applications in the natural sciences and engineering. The initial understanding of these complex multidimensional datasets often requires human intervention through visual examination, which may be hampered by the varying levels of contrast permeating through the dimensions. We show both qualitatively and quantitatively that using our multidimensional extension of CLAHE (MCLAHE) simultaneously on all dimensions of the datasets allows better visualization and discernment of multidimensional image features, as demonstrated using cases from 4D photoemission spectroscopy and fluorescence microscopy. Our implementation of multidimensional CLAHE in Tensorflow is publicly accessible and supports parallelization with multiple CPUs and various other hardware accelerators, including GPUs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1906.11355v3-abstract-full').style.display = 'none'; document.getElementById('1906.11355v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 November, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 June, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> IEEE Access 7, 165437 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1901.00312">arXiv:1901.00312</a> <span> [<a href="https://arxiv.org/pdf/1901.00312">pdf</a>, <a href="https://arxiv.org/format/1901.00312">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Data Analysis, Statistics and Probability">physics.data-an</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/10.1016/j.ultramic.2019.04.004">10.1016/j.ultramic.2019.04.004 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Symmetry-guided nonrigid registration: the case for distortion correction in multidimensional photoemission spectroscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Xian%2C+R+P">Rui Patrick Xian</a>, <a href="/search/physics?searchtype=author&query=Rettig%2C+L">Laurenz Rettig</a>, <a href="/search/physics?searchtype=author&query=Ernstorfer%2C+R">Ralph Ernstorfer</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="1901.00312v2-abstract-short" style="display: inline;"> Image symmetrization is an effective strategy to correct symmetry distortion in experimental data for which symmetry is essential in the subsequent analysis. In the process, a coordinate transform, the symmetrization transform, is required to undo the distortion. The transform may be determined by image registration (i.e. alignment) with symmetry constraints imposed in the registration target and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.00312v2-abstract-full').style.display = 'inline'; document.getElementById('1901.00312v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1901.00312v2-abstract-full" style="display: none;"> Image symmetrization is an effective strategy to correct symmetry distortion in experimental data for which symmetry is essential in the subsequent analysis. In the process, a coordinate transform, the symmetrization transform, is required to undo the distortion. The transform may be determined by image registration (i.e. alignment) with symmetry constraints imposed in the registration target and in the iterative parameter tuning, which we call symmetry-guided registration. An example use case of image symmetrization is found in electronic band structure mapping by multidimensional photoemission spectroscopy, which employs a 3D time-of-flight detector to measure electrons sorted into the momentum ($k_x$, $k_y$) and energy ($E$) coordinates. In reality, imperfect instrument design, sample geometry and experimental settings cause distortion of the photoelectron trajectories and, therefore, the symmetry in the measured band structure, which hinders the full understanding and use of the volumetric datasets. We demonstrate that symmetry-guided registration can correct the symmetry distortion in the momentum-resolved photoemission patterns. Using proposed symmetry metrics, we show quantitatively that the iterative approach to symmetrization outperforms its non-iterative counterpart in the restored symmetry of the outcome while preserving the average shape of the photoemission pattern. Our approach is generalizable to distortion corrections in different types of symmetries and should also find applications in other experimental methods that produce images with similar features. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.00312v2-abstract-full').style.display = 'none'; document.getElementById('1901.00312v2-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 April, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 January, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Ultramicroscopy 202, 133 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1811.06939">arXiv:1811.06939</a> <span> [<a href="https://arxiv.org/pdf/1811.06939">pdf</a>, <a href="https://arxiv.org/format/1811.06939">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</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/10.1063/1.5081938">10.1063/1.5081938 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Time- and angle-resolved photoemission spectroscopy of solids in the extreme ultraviolet at 500 kHz repetition rate </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Puppin%2C+M">M. Puppin</a>, <a href="/search/physics?searchtype=author&query=Deng%2C+Y">Y. Deng</a>, <a href="/search/physics?searchtype=author&query=Nicholson%2C+C+W">C. W. Nicholson</a>, <a href="/search/physics?searchtype=author&query=Feldl%2C+J">J. Feldl</a>, <a href="/search/physics?searchtype=author&query=Schroeter%2C+N+B+M">N. B. M. Schroeter</a>, <a href="/search/physics?searchtype=author&query=Vita%2C+H">H. Vita</a>, <a href="/search/physics?searchtype=author&query=Kirchmann%2C+P+S">P. S. Kirchmann</a>, <a href="/search/physics?searchtype=author&query=Monney%2C+C">C. Monney</a>, <a href="/search/physics?searchtype=author&query=Rettig%2C+L">L. Rettig</a>, <a href="/search/physics?searchtype=author&query=Wolf%2C+M">M. Wolf</a>, <a href="/search/physics?searchtype=author&query=Ernstorfer%2C+R">R. Ernstorfer</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="1811.06939v2-abstract-short" style="display: inline;"> Time- and angle-resolved photoelectron spectroscopy (trARPES) employing a 500 kHz extreme-ultravioled (XUV) light source operating at 21.7 eV probe photon energy is reported. Based on a high-power ytterbium laser, optical parametric chirped pulse amplification (OPCPA), and ultraviolet-driven high-harmonic generation, the light source produces an isolated high-harmonic with 110 meV bandwidth and a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1811.06939v2-abstract-full').style.display = 'inline'; document.getElementById('1811.06939v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1811.06939v2-abstract-full" style="display: none;"> Time- and angle-resolved photoelectron spectroscopy (trARPES) employing a 500 kHz extreme-ultravioled (XUV) light source operating at 21.7 eV probe photon energy is reported. Based on a high-power ytterbium laser, optical parametric chirped pulse amplification (OPCPA), and ultraviolet-driven high-harmonic generation, the light source produces an isolated high-harmonic with 110 meV bandwidth and a flux of more than $10^{11}$ photons/second on the sample. Combined with a state-of-the-art ARPES chamber, this table-top experiment allows high-repetition rate pump-probe experiments of electron dynamics in occupied and normally unoccupied (excited) states in the entire Brillouin zone and with a temporal system response function below 40 fs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1811.06939v2-abstract-full').style.display = 'none'; document.getElementById('1811.06939v2-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 February, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 November, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Accepted for publication in Review of Scientific Instruments</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Review of Scientific Instruments 90, 023104 (2019); https://doi.org/10.1063/1.5081938 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1803.01766">arXiv:1803.01766</a> <span> [<a href="https://arxiv.org/pdf/1803.01766">pdf</a>, <a href="https://arxiv.org/format/1803.01766">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Point-projection microscopy of nano-localized photoemission currents at sub-40 femtosecond time scales </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Kre%C4%8Dini%C4%87%2C+F">Faruk Kre膷ini膰</a>, <a href="/search/physics?searchtype=author&query=Malter%2C+J">Jannik Malter</a>, <a href="/search/physics?searchtype=author&query=Paarmann%2C+A">Alexander Paarmann</a>, <a href="/search/physics?searchtype=author&query=M%C3%BCller%2C+M">Melanie M眉ller</a>, <a href="/search/physics?searchtype=author&query=Ernstorfer%2C+R">Ralph Ernstorfer</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="1803.01766v1-abstract-short" style="display: inline;"> Femtosecond point-projection microscopy (fs-PPM) is an electron microscopy technique that possesses a combination of high spatio-temporal resolution and sensitivity to local electric fields. This allows it to visualize ultrafast charge carrier dynamics in complex nanomaterials. We benchmark the capability of the fs-PPM technique by imaging the ultrafast dynamics of charge carriers produced by mult… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1803.01766v1-abstract-full').style.display = 'inline'; document.getElementById('1803.01766v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1803.01766v1-abstract-full" style="display: none;"> Femtosecond point-projection microscopy (fs-PPM) is an electron microscopy technique that possesses a combination of high spatio-temporal resolution and sensitivity to local electric fields. This allows it to visualize ultrafast charge carrier dynamics in complex nanomaterials. We benchmark the capability of the fs-PPM technique by imaging the ultrafast dynamics of charge carriers produced by multiphoton ionization of silver nanowires. The space-charge driven motion of photoelectrons is followed on \mbox{sub-100}\,nm length scales, while the dynamics are captured on 30-100 fs time scales. The build-up of electron holes in the silver nanowires following photoelectron ejection, i.e. positive charging, has also been observed. The fastest observed photoelectron temporal response is 33 fs (FWHM), which represents an upper estimate of the instrument response function and is consistent with an expected electron wavepacket duration of 13 fs based on simulations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1803.01766v1-abstract-full').style.display = 'none'; document.getElementById('1803.01766v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 March, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2018. </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, 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/1608.03486">arXiv:1608.03486</a> <span> [<a href="https://arxiv.org/pdf/1608.03486">pdf</a>, <a href="https://arxiv.org/ps/1608.03486">ps</a>, <a href="https://arxiv.org/format/1608.03486">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</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.95.054302">10.1103/PhysRevB.95.054302 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Coherent and Incoherent Structural Dynamics in Laser-Excited Antimony </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Waldecker%2C+L">Lutz Waldecker</a>, <a href="/search/physics?searchtype=author&query=Zier%2C+T">Tobias Zier</a>, <a href="/search/physics?searchtype=author&query=Vasileiadis%2C+T">Thomas Vasileiadis</a>, <a href="/search/physics?searchtype=author&query=Bertoni%2C+R">Roman Bertoni</a>, <a href="/search/physics?searchtype=author&query=H.%2C+F+V">Felipe Valencia H.</a>, <a href="/search/physics?searchtype=author&query=Garcia%2C+M+E">Martin E. Garcia</a>, <a href="/search/physics?searchtype=author&query=Zijlstra%2C+E+S">Eeuwe S. Zijlstra</a>, <a href="/search/physics?searchtype=author&query=Ernstorfer%2C+R">Ralph Ernstorfer</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="1608.03486v2-abstract-short" style="display: inline;"> We investigate the excitation of phonons in photoexcited antimony and demonstrate that the entire electron-lattice interactions, in particular coherent and incoherent electron-phonon coupling, can be probed simultaneously. Using femtosecond electron diffraction (FED) with high temporal resolution, we observe the coherent excitation of the fully symmetric \Ag\ optical phonon mode via the shift of t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1608.03486v2-abstract-full').style.display = 'inline'; document.getElementById('1608.03486v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1608.03486v2-abstract-full" style="display: none;"> We investigate the excitation of phonons in photoexcited antimony and demonstrate that the entire electron-lattice interactions, in particular coherent and incoherent electron-phonon coupling, can be probed simultaneously. Using femtosecond electron diffraction (FED) with high temporal resolution, we observe the coherent excitation of the fully symmetric \Ag\ optical phonon mode via the shift of the minimum of the atomic potential energy surface. Ab initio molecular dynamics simulations on laser excited potential energy surfaces are performed to quantify the change in lattice potential and the associated real-space amplitude of the coherent atomic oscillations. Good agreement is obtained between the parameter-free calculations and the experiment. In addition, our experimental configuration allows observing the energy transfer from electrons to phonons via incoherent electron-lattice scattering events. The electron-phonon coupling is determined as a function of electronic temperature from our DFT calculations and the data by applying different models for the energy-transfer. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1608.03486v2-abstract-full').style.display = 'none'; document.getElementById('1608.03486v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 January, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 August, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 95, 054302 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1608.01854">arXiv:1608.01854</a> <span> [<a href="https://arxiv.org/pdf/1608.01854">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="Optics">physics.optics</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/10.1364/OPTICA.3.001358">10.1364/OPTICA.3.001358 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Sub-cycle optical control of current in a semiconductor: from the multiphoton to the tunneling regime </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Paasch-Colberg%2C+T">Tim Paasch-Colberg</a>, <a href="/search/physics?searchtype=author&query=Kruchinin%2C+S+Y">Stanislav Yu. Kruchinin</a>, <a href="/search/physics?searchtype=author&query=Sa%C4%9Flam%2C+%C3%96">脰zge Sa臒lam</a>, <a href="/search/physics?searchtype=author&query=Kapser%2C+S">Stefan Kapser</a>, <a href="/search/physics?searchtype=author&query=Cabrini%2C+S">Stefano Cabrini</a>, <a href="/search/physics?searchtype=author&query=Muehlbrandt%2C+S">Sascha Muehlbrandt</a>, <a href="/search/physics?searchtype=author&query=Reichert%2C+J">Joachim Reichert</a>, <a href="/search/physics?searchtype=author&query=Barth%2C+J+V">Johannes V. Barth</a>, <a href="/search/physics?searchtype=author&query=Ernstorfer%2C+R">Ralph Ernstorfer</a>, <a href="/search/physics?searchtype=author&query=Kienberger%2C+R">Reinhard Kienberger</a>, <a href="/search/physics?searchtype=author&query=Yakovlev%2C+V+S">Vladislav S. Yakovlev</a>, <a href="/search/physics?searchtype=author&query=Karpowicz%2C+N">Nicholas Karpowicz</a>, <a href="/search/physics?searchtype=author&query=Schiffrin%2C+A">Agustin Schiffrin</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="1608.01854v2-abstract-short" style="display: inline;"> Nonlinear interactions between ultrashort optical waveforms and solids can be used to induce and steer electric current on a femtosecond (fs) timescale, holding promise for electronic signal processing at PHz frequencies [Nature 493, 70 (2013)]. So far, this approach has been limited to insulators, requiring extremely strong peak electric fields and intensities. Here, we show all-optical generatio… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1608.01854v2-abstract-full').style.display = 'inline'; document.getElementById('1608.01854v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1608.01854v2-abstract-full" style="display: none;"> Nonlinear interactions between ultrashort optical waveforms and solids can be used to induce and steer electric current on a femtosecond (fs) timescale, holding promise for electronic signal processing at PHz frequencies [Nature 493, 70 (2013)]. So far, this approach has been limited to insulators, requiring extremely strong peak electric fields and intensities. Here, we show all-optical generation and control of directly measurable electric current in a semiconductor relevant for high-speed and high-power (opto)electronics, gallium nitride (GaN), within an optical cycle and on a timescale shorter than 2 fs, at intensities at least an order of magnitude lower than those required for dielectrics. Our approach opens the door to PHz electronics and metrology, applicable to low-power (non-amplified) laser pulses, and may lead to future applications in semiconductor and photonic integrated circuit technologies. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1608.01854v2-abstract-full').style.display = 'none'; document.getElementById('1608.01854v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 November, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 August, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Optica 3(12), 1358-1361 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1412.1942">arXiv:1412.1942</a> <span> [<a href="https://arxiv.org/pdf/1412.1942">pdf</a>, <a href="https://arxiv.org/ps/1412.1942">ps</a>, <a href="https://arxiv.org/format/1412.1942">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-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/10.1063/1.4906786">10.1063/1.4906786 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Compact femtosecond electron diffractometer with 100 keV electron bunches approaching the single-electron pulse duration limit </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Waldecker%2C+L">Lutz Waldecker</a>, <a href="/search/physics?searchtype=author&query=Bertoni%2C+R">Roman Bertoni</a>, <a href="/search/physics?searchtype=author&query=Ernstorfer%2C+R">Ralph Ernstorfer</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="1412.1942v2-abstract-short" style="display: inline;"> We present the design and implementation of a highly compact femtosecond electron diffractometer working at electron energies up to 100 keV. We use a multi-body particle tracing code to simulate electron bunch propagation through the setup and to calculate pulse durations at the sample position. Our simulations show that electron bunches containing few thousands of electrons per bunch are only wea… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1412.1942v2-abstract-full').style.display = 'inline'; document.getElementById('1412.1942v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1412.1942v2-abstract-full" style="display: none;"> We present the design and implementation of a highly compact femtosecond electron diffractometer working at electron energies up to 100 keV. We use a multi-body particle tracing code to simulate electron bunch propagation through the setup and to calculate pulse durations at the sample position. Our simulations show that electron bunches containing few thousands of electrons per bunch are only weakly broadened by space-charge effects and their pulse duration is thus close to the one of a single-electron wavepacket. With our compact setup we can create electron bunches containing up to 5000 electrons with a pulse duration below 100 femtoseconds on the sample. We use the diffractometer to track the energy transfer from photoexcited electrons to the lattice in a thin film of titanium. This process takes place on the timescale of few-hundred femtoseconds and a fully equilibrated state is reached within one picosecond. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1412.1942v2-abstract-full').style.display = 'none'; document.getElementById('1412.1942v2-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, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 December, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2014. </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, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Appl. Phys. 117, 044903 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1409.6642">arXiv:1409.6642</a> <span> [<a href="https://arxiv.org/pdf/1409.6642">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </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/10.1364/OE.23.001491">10.1364/OE.23.001491 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Tunable sub-20 fs pulses from a 500 kHz OPCPA with 15 W average power based on an all-ytterbium laser </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Puppin%2C+M">Michele Puppin</a>, <a href="/search/physics?searchtype=author&query=Deng%2C+Y">Yunpei Deng</a>, <a href="/search/physics?searchtype=author&query=Prochnow%2C+O">Oliver Prochnow</a>, <a href="/search/physics?searchtype=author&query=Ahrens%2C+J">Jan Ahrens</a>, <a href="/search/physics?searchtype=author&query=Binhammer%2C+T">Thomas Binhammer</a>, <a href="/search/physics?searchtype=author&query=Morgner%2C+U">Uwe Morgner</a>, <a href="/search/physics?searchtype=author&query=Krenz%2C+M">Marcel Krenz</a>, <a href="/search/physics?searchtype=author&query=Wolf%2C+M">Martin Wolf</a>, <a href="/search/physics?searchtype=author&query=Ernstorfer%2C+R">Ralph Ernstorfer</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="1409.6642v1-abstract-short" style="display: inline;"> An optical parametric chirped pulse amplifier fully based on Yb lasers at 500 kHz is described. Passive optical-synchronization is achieved between a fiber laser-pumped white-light and a 515 nm pump produced with a 200 W picosecond Yb:YAG InnoSlab amplifier. An output power up to 19.7 W with long-term stability of 0.3% is demonstrated for wavelength tunable pulses between 680 nm and 900 nm and spe… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1409.6642v1-abstract-full').style.display = 'inline'; document.getElementById('1409.6642v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1409.6642v1-abstract-full" style="display: none;"> An optical parametric chirped pulse amplifier fully based on Yb lasers at 500 kHz is described. Passive optical-synchronization is achieved between a fiber laser-pumped white-light and a 515 nm pump produced with a 200 W picosecond Yb:YAG InnoSlab amplifier. An output power up to 19.7 W with long-term stability of 0.3% is demonstrated for wavelength tunable pulses between 680 nm and 900 nm and spectral stability of 0.2%; 16.5 W can be achieved with a bandwidth supporting 5.4 fs pulses. We demonstrate compression of 30 microjoule pulses to sub-20 fs duration with a prism compressor, suitable for high harmonic generation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1409.6642v1-abstract-full').style.display = 'none'; document.getElementById('1409.6642v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 September, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2014. </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> Optics Express Vol. 23, Issue 2, pp. 1491-1497 (2015) </p> </li> </ol> <div class="is-hidden-tablet">  <span 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