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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/2403.17203">arXiv:2403.17203</a> <span> [<a href="https://arxiv.org/pdf/2403.17203">pdf</a>, <a href="https://arxiv.org/format/2403.17203">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Observation of polarization density waves in SrTiO3 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Orenstein%2C+G">Gal Orenstein</a>, <a href="/search/cond-mat?searchtype=author&query=Krapivin%2C+V">Viktor Krapivin</a>, <a href="/search/cond-mat?searchtype=author&query=Huang%2C+Y">Yijing Huang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhan%2C+Z">Zhuquan Zhan</a>, <a href="/search/cond-mat?searchtype=author&query=Munoz%2C+G+d+l+P">Gilberto de la Pena Munoz</a>, <a href="/search/cond-mat?searchtype=author&query=Duncan%2C+R+A">Ryan A. Duncan</a>, <a href="/search/cond-mat?searchtype=author&query=Nguyen%2C+Q">Quynh Nguyen</a>, <a href="/search/cond-mat?searchtype=author&query=Stanton%2C+J">Jade Stanton</a>, <a href="/search/cond-mat?searchtype=author&query=Teitelbaum%2C+S">Samuel Teitelbaum</a>, <a href="/search/cond-mat?searchtype=author&query=Yavas%2C+H">Hasan Yavas</a>, <a href="/search/cond-mat?searchtype=author&query=Sato%2C+T">Takahiro Sato</a>, <a href="/search/cond-mat?searchtype=author&query=Hoffmann%2C+M+C">Matthias C. Hoffmann</a>, <a href="/search/cond-mat?searchtype=author&query=Kramer%2C+P">Patrick Kramer</a>, <a href="/search/cond-mat?searchtype=author&query=Zhang%2C+J">Jiahao Zhang</a>, <a href="/search/cond-mat?searchtype=author&query=Cavalleri%2C+A">Andrea Cavalleri</a>, <a href="/search/cond-mat?searchtype=author&query=Comin%2C+R">Riccardo Comin</a>, <a href="/search/cond-mat?searchtype=author&query=Dean%2C+M+P+M">Mark P. M. Dean</a>, <a href="/search/cond-mat?searchtype=author&query=Disa%2C+A+S">Ankit S. Disa</a>, <a href="/search/cond-mat?searchtype=author&query=Forst%2C+M">Michael Forst</a>, <a href="/search/cond-mat?searchtype=author&query=Johnson%2C+S+L">Steven L. Johnson</a>, <a href="/search/cond-mat?searchtype=author&query=Mitrano%2C+M">Matteo Mitrano</a>, <a href="/search/cond-mat?searchtype=author&query=Rappe%2C+A+M">Andrew M. Rappe</a>, <a href="/search/cond-mat?searchtype=author&query=Reis%2C+D">David Reis</a>, <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+D">Diling Zhu</a>, <a href="/search/cond-mat?searchtype=author&query=Nelson%2C+K+A">Keith A. Nelson</a> , et al. (1 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="2403.17203v1-abstract-short" style="display: inline;"> The nature of the "failed" ferroelectric transition in SrTiO3 has been a long-standing puzzle in condensed matter physics. A compelling explanation is the competition between ferroelectricity and an instability with a mesoscopic modulation of the polarization. These polarization density waves, which should become especially strong near the quantum critical point, break local inversion symmetry and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.17203v1-abstract-full').style.display = 'inline'; document.getElementById('2403.17203v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.17203v1-abstract-full" style="display: none;"> The nature of the "failed" ferroelectric transition in SrTiO3 has been a long-standing puzzle in condensed matter physics. A compelling explanation is the competition between ferroelectricity and an instability with a mesoscopic modulation of the polarization. These polarization density waves, which should become especially strong near the quantum critical point, break local inversion symmetry and are difficult to probe with conventional x-ray scattering methods. Here we combine a femtosecond x-ray free electron laser (XFEL) with THz coherent control methods to probe inversion symmetry breaking at finite momenta and visualize the instability of the polarization on nanometer lengthscales in SrTiO3. We find polar-acoustic collective modes that are soft particularly at the tens of nanometer lengthscale. These precursor collective excitations provide evidence for the conjectured mesoscopic modulated phase in SrTiO3. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.17203v1-abstract-full').style.display = 'none'; document.getElementById('2403.17203v1-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 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2401.17437">arXiv:2401.17437</a> <span> [<a href="https://arxiv.org/pdf/2401.17437">pdf</a>, <a href="https://arxiv.org/format/2401.17437">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/10.1088/1361-6633/ad71ee">10.1088/1361-6633/ad71ee <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Ultrafast measurements under anisotropic strain reveal near equivalence of competing charge orders in TbTe$_3$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Soyeun Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Orenstein%2C+G">Gal Orenstein</a>, <a href="/search/cond-mat?searchtype=author&query=Singh%2C+A+G">Anisha G. Singh</a>, <a href="/search/cond-mat?searchtype=author&query=Fisher%2C+I+R">Ian R. Fisher</a>, <a href="/search/cond-mat?searchtype=author&query=Reis%2C+D+A">David A. Reis</a>, <a href="/search/cond-mat?searchtype=author&query=Trigo%2C+M">Mariano Trigo</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="2401.17437v2-abstract-short" style="display: inline;"> We report ultrafast reflectivity measurements of the dynamics of the order parameter of the charge density wave (CDW) in TbTe$_3$ under anisotropic strain. We observe an increase in the frequency of the amplitude mode with increasing tensile strain along the $a$-axis (which drives the lattice into $a>c$, with $a$ and $c$ the lattice constants), and similar behavior for tensile strain along $c$ (… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.17437v2-abstract-full').style.display = 'inline'; document.getElementById('2401.17437v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2401.17437v2-abstract-full" style="display: none;"> We report ultrafast reflectivity measurements of the dynamics of the order parameter of the charge density wave (CDW) in TbTe$_3$ under anisotropic strain. We observe an increase in the frequency of the amplitude mode with increasing tensile strain along the $a$-axis (which drives the lattice into $a>c$, with $a$ and $c$ the lattice constants), and similar behavior for tensile strain along $c$ ($c>a$). This suggests that both strains stabilize the corresponding CDW order and further support the near equivalence of the CDW phases oriented in $a$- and $c$-axis, in spite of the orthorhombic space group. The results were analyzed within the time-dependent Ginzburg-Landau framework, which agrees well with the reflectivity dynamics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.17437v2-abstract-full').style.display = 'none'; document.getElementById('2401.17437v2-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">v1</span> submitted 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">7 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/2309.13003">arXiv:2309.13003</a> <span> [<a href="https://arxiv.org/pdf/2309.13003">pdf</a>, <a href="https://arxiv.org/format/2309.13003">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="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/10.1038/s41566-022-01010-1">10.1038/s41566-022-01010-1 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Observation of light driven band structure via multi-band high harmonic spectroscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Uzan-Narovlansky%2C+A+J">Ayelet J. Uzan-Narovlansky</a>, <a href="/search/cond-mat?searchtype=author&query=Jim%C3%A9nez-Gal%C3%A1n%2C+%C3%81">脕lvaro Jim茅nez-Gal谩n</a>, <a href="/search/cond-mat?searchtype=author&query=Orenstein%2C+G">Gal Orenstein</a>, <a href="/search/cond-mat?searchtype=author&query=Silva%2C+R+E+F">Rui E. F. Silva</a>, <a href="/search/cond-mat?searchtype=author&query=Arusi-Parpar%2C+T">Talya Arusi-Parpar</a>, <a href="/search/cond-mat?searchtype=author&query=Shames%2C+S">Sergei Shames</a>, <a href="/search/cond-mat?searchtype=author&query=Bruner%2C+B+D">Barry D. Bruner</a>, <a href="/search/cond-mat?searchtype=author&query=Yan%2C+B">Binghai Yan</a>, <a href="/search/cond-mat?searchtype=author&query=Smirnova%2C+O">Olga Smirnova</a>, <a href="/search/cond-mat?searchtype=author&query=Ivanov%2C+M">Misha Ivanov</a>, <a href="/search/cond-mat?searchtype=author&query=Dudovich%2C+N">Nirit Dudovich</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2309.13003v1-abstract-short" style="display: inline;"> Intense light-matter interactions have revolutionized our ability to probe and manipulate quantum systems at sub-femtosecond time scales, opening routes to all-optical control of electronic currents in solids at petahertz rates. Such control typically requires electric field amplitudes $\sim V/脜$, when the voltage drop across a lattice site becomes comparable to the characteristic band gap energie… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.13003v1-abstract-full').style.display = 'inline'; document.getElementById('2309.13003v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2309.13003v1-abstract-full" style="display: none;"> Intense light-matter interactions have revolutionized our ability to probe and manipulate quantum systems at sub-femtosecond time scales, opening routes to all-optical control of electronic currents in solids at petahertz rates. Such control typically requires electric field amplitudes $\sim V/脜$, when the voltage drop across a lattice site becomes comparable to the characteristic band gap energies. In this regime, intense light-matter interaction induces significant modifications of electronic and optical properties, dramatically modifying the crystal band structure. Yet, identifying and characterizing such modifications remains an outstanding problem. As the oscillating electric field changes within the driving field's cycle, does the band-structure follow, and how can it be defined? Here we address this fundamental question, proposing all-optical spectroscopy to probe laser-induced closing of the band-gap between adjacent conduction bands. Our work reveals the link between nonlinear light matter interactions in strongly driven crystals and the sub-cycle modifications in their effective band structure. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.13003v1-abstract-full').style.display = 'none'; document.getElementById('2309.13003v1-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 September, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Photonics 16 428-432 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2304.00168">arXiv:2304.00168</a> <span> [<a href="https://arxiv.org/pdf/2304.00168">pdf</a>, <a href="https://arxiv.org/format/2304.00168">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Dynamical Scaling Reveals Topological Defects and Anomalous Evolution of a Photoinduced Phase Transition </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Orenstein%2C+G">Gal Orenstein</a>, <a href="/search/cond-mat?searchtype=author&query=Duncan%2C+R+A">Ryan A. Duncan</a>, <a href="/search/cond-mat?searchtype=author&query=Munoz%2C+G+A+d+l+P">Gilberto A. de la Pena Munoz</a>, <a href="/search/cond-mat?searchtype=author&query=Huang%2C+Y">Yijing Huang</a>, <a href="/search/cond-mat?searchtype=author&query=Krapivin%2C+V">Viktor Krapivin</a>, <a href="/search/cond-mat?searchtype=author&query=Nguyen%2C+Q+L">Quynh Le Nguyen</a>, <a href="/search/cond-mat?searchtype=author&query=Teitelbaum%2C+S">Samuel Teitelbaum</a>, <a href="/search/cond-mat?searchtype=author&query=Singh%2C+A+G">Anisha G. Singh</a>, <a href="/search/cond-mat?searchtype=author&query=Mankowsky%2C+R">Roman Mankowsky</a>, <a href="/search/cond-mat?searchtype=author&query=Lemke%2C+H">Henrik Lemke</a>, <a href="/search/cond-mat?searchtype=author&query=Sander%2C+M">Mathias Sander</a>, <a href="/search/cond-mat?searchtype=author&query=Deng%2C+Y">Yunpei Deng</a>, <a href="/search/cond-mat?searchtype=author&query=Arrell%2C+C">Christopher Arrell</a>, <a href="/search/cond-mat?searchtype=author&query=Fisher%2C+I+R">Ian R. Fisher</a>, <a href="/search/cond-mat?searchtype=author&query=Reis%2C+D+A">David A. Reis</a>, <a href="/search/cond-mat?searchtype=author&query=Trigo%2C+M">Mariano Trigo</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="2304.00168v2-abstract-short" style="display: inline;"> Nonequilibrium states of quantum materials can exhibit exotic properties and enable unprecedented functionality and applications. These transient states are inherently inhomogeneous, characterized by the formation of topologically protected structures, requiring nanometer spatial resolution on femtosecond timescales to resolve their evolution. Using ultrafast total x-ray scattering at a free elect… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.00168v2-abstract-full').style.display = 'inline'; document.getElementById('2304.00168v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2304.00168v2-abstract-full" style="display: none;"> Nonequilibrium states of quantum materials can exhibit exotic properties and enable unprecedented functionality and applications. These transient states are inherently inhomogeneous, characterized by the formation of topologically protected structures, requiring nanometer spatial resolution on femtosecond timescales to resolve their evolution. Using ultrafast total x-ray scattering at a free electron laser and a sophisticated scaling analysis, we gain unique access to the dynamics on the relevant mesoscopic lengthscales. Our results provide direct evidence that ultrafast excitation of LaTe$_3$ leads to formation of topological vortex strings of the charge density wave. These dislocations of the charge density wave exhibit anomalous, subdiffusive dynamics, slowing the equilibration process, providing rare insight into the nonequilibrium mesoscopic response in a quantum material. Our findings establish a general framework to investigate properties of topological defects, which are expected to be ubiquitous in nonequilibrium phase transitions and may arrest equilibration and enhance competing orders. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2304.00168v2-abstract-full').style.display = 'none'; document.getElementById('2304.00168v2-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 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 31 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2301.08703">arXiv:2301.08703</a> <span> [<a href="https://arxiv.org/pdf/2301.08703">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"> Quenched lattice fluctuations in optically driven SrTiO3 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Fechner%2C+M">M. Fechner</a>, <a href="/search/cond-mat?searchtype=author&query=F%C3%B6rst%2C+M">M. F枚rst</a>, <a href="/search/cond-mat?searchtype=author&query=Orenstein%2C+G">G. Orenstein</a>, <a href="/search/cond-mat?searchtype=author&query=Krapivin%2C+V">V. Krapivin</a>, <a href="/search/cond-mat?searchtype=author&query=Disa%2C+A+S">A. S. Disa</a>, <a href="/search/cond-mat?searchtype=author&query=Buzzi%2C+M">M. Buzzi</a>, <a href="/search/cond-mat?searchtype=author&query=von+Hoegen%2C+A">A. von Hoegen</a>, <a href="/search/cond-mat?searchtype=author&query=de+la+Pena%2C+G">G. de la Pena</a>, <a href="/search/cond-mat?searchtype=author&query=Nguyen%2C+Q+L">Q. L Nguyen</a>, <a href="/search/cond-mat?searchtype=author&query=Mankowsky%2C+R">R. Mankowsky</a>, <a href="/search/cond-mat?searchtype=author&query=Sander%2C+M">M. Sander</a>, <a href="/search/cond-mat?searchtype=author&query=Lemke%2C+H">H. Lemke</a>, <a href="/search/cond-mat?searchtype=author&query=Deng%2C+Y">Y. Deng</a>, <a href="/search/cond-mat?searchtype=author&query=Trigo%2C+M">M. Trigo</a>, <a href="/search/cond-mat?searchtype=author&query=Cavalleri%2C+A">A. Cavalleri</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2301.08703v1-abstract-short" style="display: inline;"> Many functionally relevant ferroic phenomena in quantum materials can be manipulated by driving the lattice coherently with optical and terahertz pulses. New physical phenomena and non-equilibrium phases that have no equilibrium counterpart have been discovered following these protocols. The underlying structural dynamics has been mostly studied by recording the average atomic position along dynam… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.08703v1-abstract-full').style.display = 'inline'; document.getElementById('2301.08703v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2301.08703v1-abstract-full" style="display: none;"> Many functionally relevant ferroic phenomena in quantum materials can be manipulated by driving the lattice coherently with optical and terahertz pulses. New physical phenomena and non-equilibrium phases that have no equilibrium counterpart have been discovered following these protocols. The underlying structural dynamics has been mostly studied by recording the average atomic position along dynamical structural coordinates with elastic scattering methods. However, crystal lattice fluctuations, which are known to influence phase transitions in equilibrium, are also expected to determine these dynamics but have rarely been explored. Here, we study the driven dynamics of the quantum paraelectric SrTiO3, in which mid-infrared drives have been shown to induce a metastable ferroelectric state. Crucial in these physics is the competition between the polar instability and antiferrodistortive rotations, which in equilibrium frustrate the formation of long-range ferroelectricity. We make use of high intensity mid-infrared optical pulses to resonantly drive a Ti-O stretching mode at 17 THz, and we measure the resulting change in lattice fluctuations using time-resolved x-ray diffuse scattering at a free electron laser. After a prompt increase, we observe a long-lived quench in R-point antiferrodistortive lattice fluctuations. The enhancement and reduction in lattice fluctuations are explained theoretically by considering fourth-order nonlinear phononic interactions and third-order coupling to the driven optical phonon and to lattice strain, respectively. These observations provide a number of new and testable hypotheses for the physics of light-induced ferroelectricity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.08703v1-abstract-full').style.display = 'none'; document.getElementById('2301.08703v1-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 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.17483">arXiv:2210.17483</a> <span> [<a href="https://arxiv.org/pdf/2210.17483">pdf</a>, <a href="https://arxiv.org/format/2210.17483">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Ultrafast x-ray scattering reveals composite amplitude collective mode in the Weyl charge density wave material (TaSe$_4$)$_2$I </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Nguyen%2C+Q+L">Quynh L. Nguyen</a>, <a href="/search/cond-mat?searchtype=author&query=Duncan%2C+R+A">Ryan A. Duncan</a>, <a href="/search/cond-mat?searchtype=author&query=Orenstein%2C+G">Gal Orenstein</a>, <a href="/search/cond-mat?searchtype=author&query=Huang%2C+Y">Yijing Huang</a>, <a href="/search/cond-mat?searchtype=author&query=Krapivin%2C+V">Viktor Krapivin</a>, <a href="/search/cond-mat?searchtype=author&query=de+la+Pena%2C+G">Gilberto de la Pena</a>, <a href="/search/cond-mat?searchtype=author&query=Ornelas-Skarin%2C+C">Chance Ornelas-Skarin</a>, <a href="/search/cond-mat?searchtype=author&query=Reis%2C+D+A">David A. Reis</a>, <a href="/search/cond-mat?searchtype=author&query=Abbamonte%2C+P">Peter Abbamonte</a>, <a href="/search/cond-mat?searchtype=author&query=Bettler%2C+S">Simon Bettler</a>, <a href="/search/cond-mat?searchtype=author&query=Chollet%2C+M">Matthieu Chollet</a>, <a href="/search/cond-mat?searchtype=author&query=Hoffmann%2C+M+C">Matthias C. Hoffmann</a>, <a href="/search/cond-mat?searchtype=author&query=Hurley%2C+M">Matthew Hurley</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Soyeun Kim</a>, <a href="/search/cond-mat?searchtype=author&query=Kirchmann%2C+P+S">Patrick S. Kirchmann</a>, <a href="/search/cond-mat?searchtype=author&query=Kubota%2C+Y">Yuya Kubota</a>, <a href="/search/cond-mat?searchtype=author&query=Mahmood%2C+F">Fahad Mahmood</a>, <a href="/search/cond-mat?searchtype=author&query=Miller%2C+A">Alexander Miller</a>, <a href="/search/cond-mat?searchtype=author&query=Osaka%2C+T">Taito Osaka</a>, <a href="/search/cond-mat?searchtype=author&query=Qu%2C+K">Kejian Qu</a>, <a href="/search/cond-mat?searchtype=author&query=Sato%2C+T">Takahiro Sato</a>, <a href="/search/cond-mat?searchtype=author&query=Shoemaker%2C+D+P">Daniel P. Shoemaker</a>, <a href="/search/cond-mat?searchtype=author&query=Sirica%2C+N">Nicholas Sirica</a>, <a href="/search/cond-mat?searchtype=author&query=Song%2C+S">Sanghoon Song</a>, <a href="/search/cond-mat?searchtype=author&query=Stanton%2C+J">Jade Stanton</a> , et al. (5 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="2210.17483v2-abstract-short" style="display: inline;"> We report ultrafast x-ray scattering experiments of the quasi-1D charge density wave (CDW) material (TaSe$_4$)$_2$I following photoexcitation with femtosecond infrared laser pulses. From the time-dependent diffraction signal at the CDW sidebands we identify an amplitude mode derived primarily from the transverse acoustic component of the CDW static distortion. The dynamics of this acoustic amplitu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.17483v2-abstract-full').style.display = 'inline'; document.getElementById('2210.17483v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.17483v2-abstract-full" style="display: none;"> We report ultrafast x-ray scattering experiments of the quasi-1D charge density wave (CDW) material (TaSe$_4$)$_2$I following photoexcitation with femtosecond infrared laser pulses. From the time-dependent diffraction signal at the CDW sidebands we identify an amplitude mode derived primarily from the transverse acoustic component of the CDW static distortion. The dynamics of this acoustic amplitude mode are described well by a model of a displacive excitation, which we interpret as mediated through a coupling to the optical phonon component associated with the tetramerization of the Ta chains. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.17483v2-abstract-full').style.display = 'none'; document.getElementById('2210.17483v2-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 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 31 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2022. </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> 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