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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/2402.13133">arXiv:2402.13133</a> <span> [<a href="https://arxiv.org/pdf/2402.13133">pdf</a>, <a href="https://arxiv.org/format/2402.13133">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41567-023-02118-z">10.1038/s41567-023-02118-z <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Ultrafast lattice disordering can be accelerated by electronic collisional forces </p> <p class="authors"> <span class="search-hit">Authors:</span> <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=Correa%2C+A+A">Alfredo A. Correa</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+S">Shan Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Delaire%2C+O">Olivier Delaire</a>, <a href="/search/cond-mat?searchtype=author&query=Huang%2C+Y">Yijing Huang</a>, <a href="/search/cond-mat?searchtype=author&query=Johnson%2C+A+S">Allan S. Johnson</a>, <a href="/search/cond-mat?searchtype=author&query=Katayama%2C+T">Tetsuo Katayama</a>, <a href="/search/cond-mat?searchtype=author&query=Krapivin%2C+V">Viktor Krapivin</a>, <a href="/search/cond-mat?searchtype=author&query=Pastor%2C+E">Ernest Pastor</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=Teitelbaum%2C+S">Samuel Teitelbaum</a>, <a href="/search/cond-mat?searchtype=author&query=Vidas%2C+L">Luciana Vidas</a>, <a href="/search/cond-mat?searchtype=author&query=Wall%2C+S">Simon Wall</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="2402.13133v1-abstract-short" style="display: inline;"> In the prevalent picture of ultrafast structural phase transitions, the atomic motion occurs in a slowly varying potential energy surface determined adiabatically by the fast electrons. However, this ignores non-conservative forces caused by electron-lattice collisions, which can significantly influence atomic motion. Most ultrafast techniques only probe the average structure and are less sensitiv… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.13133v1-abstract-full').style.display = 'inline'; document.getElementById('2402.13133v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2402.13133v1-abstract-full" style="display: none;"> In the prevalent picture of ultrafast structural phase transitions, the atomic motion occurs in a slowly varying potential energy surface determined adiabatically by the fast electrons. However, this ignores non-conservative forces caused by electron-lattice collisions, which can significantly influence atomic motion. Most ultrafast techniques only probe the average structure and are less sensitive to random displacements, and therefore do not detect the role played by non-conservative forces in phase transitions. Here we show that the lattice dynamics of the prototypical insulator-to-metal transition of VO2 cannot be described by a potential energy alone. We use the sample temperature to control the preexisting lattice disorder before ultrafast photoexcitation across the phase transition and our ultrafast diffuse scattering experiments show that the fluctuations characteristic of the rutile metal develop equally fast (120 fs) at initial temperatures of 100 K and 300 K. This indicates that additional non-conservative forces are responsible for the increased lattice disorder. These results highlight the need for more sophisticated descriptions of ultrafast phenomena beyond the Born-Oppenheimer approximation as well as ultrafast probes of spatial fluctuations beyond the average unit cell measured by diffraction. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.13133v1-abstract-full').style.display = 'none'; document.getElementById('2402.13133v1-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 February, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2309.13275">arXiv:2309.13275</a> <span> [<a href="https://arxiv.org/pdf/2309.13275">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Disordered Systems and Neural Networks">cond-mat.dis-nn</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/10.1038/s41567-024-02474-4">10.1038/s41567-024-02474-4 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> All-optical seeding of a light-induced phase transition with correlated disorder </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Johnson%2C+A+S">Allan S. Johnson</a>, <a href="/search/cond-mat?searchtype=author&query=Pastor%2C+E">Ernest Pastor</a>, <a href="/search/cond-mat?searchtype=author&query=Batlle-Porro%2C+S">Sergi Batlle-Porro</a>, <a href="/search/cond-mat?searchtype=author&query=Benzidi%2C+H">Hind Benzidi</a>, <a href="/search/cond-mat?searchtype=author&query=Katayama%2C+T">Tetsuo Katayama</a>, <a href="/search/cond-mat?searchtype=author&query=Mu%C3%B1oz%2C+G+A+d+l+P">Gilberto A. de la Pe帽a Mu帽oz</a>, <a href="/search/cond-mat?searchtype=author&query=Krapivin%2C+V">Viktor Krapivin</a>, <a href="/search/cond-mat?searchtype=author&query=Kim%2C+S">Sunam Kim</a>, <a href="/search/cond-mat?searchtype=author&query=L%C3%B3pez%2C+N">N煤ria L贸pez</a>, <a href="/search/cond-mat?searchtype=author&query=Trigo%2C+M">Mariano Trigo</a>, <a href="/search/cond-mat?searchtype=author&query=Wall%2C+S+E">Simon E. Wall</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="2309.13275v1-abstract-short" style="display: inline;"> Ultrafast manipulation of vibrational coherence is an emergent route to control the structure of solids. However, this strategy can only induce long-range correlations and cannot modify atomic structure locally, which is required in many technologically-relevant phase transitions. Here, we demonstrate that ultrafast lasers can generate incoherent structural fluctuations which are more efficient fo… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.13275v1-abstract-full').style.display = 'inline'; document.getElementById('2309.13275v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2309.13275v1-abstract-full" style="display: none;"> Ultrafast manipulation of vibrational coherence is an emergent route to control the structure of solids. However, this strategy can only induce long-range correlations and cannot modify atomic structure locally, which is required in many technologically-relevant phase transitions. Here, we demonstrate that ultrafast lasers can generate incoherent structural fluctuations which are more efficient for material control than coherent vibrations, extending optical control to a wider range of materials. We observe that local, non-equilibrium lattice distortions generated by a weak laser pulse reduce the energy barrier to switch between insulating and metallic states in vanadium dioxide by 6%. Seeding inhomogeneous structural-fluctuations presents an alternative, more energy efficient, route for controlling materials that may be applicable to all solids, including those used in data and energy storage devices. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.13275v1-abstract-full').style.display = 'none'; document.getElementById('2309.13275v1-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, 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 Physics (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2307.12132">arXiv:2307.12132</a> <span> [<a href="https://arxiv.org/pdf/2307.12132">pdf</a>, <a href="https://arxiv.org/format/2307.12132">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 measurements of mode-specific deformation potentials of Bi$_2$Te$_3$ and Bi$_2$Se$_3$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Huang%2C+Y">Yijing Huang</a>, <a href="/search/cond-mat?searchtype=author&query=Querales-Flores%2C+J+D">Jos茅 D. Querales-Flores</a>, <a href="/search/cond-mat?searchtype=author&query=Teitelbaum%2C+S+W">Samuel W. Teitelbaum</a>, <a href="/search/cond-mat?searchtype=author&query=Cao%2C+J">Jiang Cao</a>, <a href="/search/cond-mat?searchtype=author&query=Henighan%2C+T">Thomas Henighan</a>, <a href="/search/cond-mat?searchtype=author&query=Liu%2C+H">Hanzhe Liu</a>, <a href="/search/cond-mat?searchtype=author&query=Jiang%2C+M">Mason Jiang</a>, <a href="/search/cond-mat?searchtype=author&query=De+la+Pe%C3%B1a%2C+G">Gilberto De la Pe帽a</a>, <a href="/search/cond-mat?searchtype=author&query=Krapivin%2C+V">Viktor Krapivin</a>, <a href="/search/cond-mat?searchtype=author&query=Haber%2C+J">Johann Haber</a>, <a href="/search/cond-mat?searchtype=author&query=Sato%2C+T">Takahiro Sato</a>, <a href="/search/cond-mat?searchtype=author&query=Chollet%2C+M">Matthieu Chollet</a>, <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+D">Diling Zhu</a>, <a href="/search/cond-mat?searchtype=author&query=Katayama%2C+T">Tetsuo Katayama</a>, <a href="/search/cond-mat?searchtype=author&query=Power%2C+R">Robert Power</a>, <a href="/search/cond-mat?searchtype=author&query=Allen%2C+M">Meabh Allen</a>, <a href="/search/cond-mat?searchtype=author&query=Rotundu%2C+C+R">Costel R. Rotundu</a>, <a href="/search/cond-mat?searchtype=author&query=Bailey%2C+T+P">Trevor P. Bailey</a>, <a href="/search/cond-mat?searchtype=author&query=Uher%2C+C">Ctirad Uher</a>, <a href="/search/cond-mat?searchtype=author&query=Trigo%2C+M">Mariano Trigo</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=Murray%2C+%C3%89+D">脡amonn D. Murray</a>, <a href="/search/cond-mat?searchtype=author&query=Shen%2C+Z">Zhi-Xun Shen</a>, <a href="/search/cond-mat?searchtype=author&query=Savic%2C+I">Ivana Savic</a>, <a href="/search/cond-mat?searchtype=author&query=Fahy%2C+S">Stephen Fahy</a> , et al. (2 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2307.12132v1-abstract-short" style="display: inline;"> Quantifying electron-phonon interactions for the surface states of topological materials can provide key insights into surface-state transport, topological superconductivity, and potentially how to manipulate the surface state using a structural degree of freedom. We perform time-resolved x-ray diffraction (XRD) and angle-resolved photoemission (ARPES) measurements on Bi$_2$Te$_3$ and Bi$_2$Se… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.12132v1-abstract-full').style.display = 'inline'; document.getElementById('2307.12132v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2307.12132v1-abstract-full" style="display: none;"> Quantifying electron-phonon interactions for the surface states of topological materials can provide key insights into surface-state transport, topological superconductivity, and potentially how to manipulate the surface state using a structural degree of freedom. We perform time-resolved x-ray diffraction (XRD) and angle-resolved photoemission (ARPES) measurements on Bi$_2$Te$_3$ and Bi$_2$Se$_3$, following the excitation of coherent A$_{1g}$ optical phonons. We extract and compare the deformation potentials coupling the surface electronic states to local A$_{1g}$-like displacements in these two materials using the experimentally determined atomic displacements from XRD and electron band shifts from ARPES.We find the coupling in Bi$_2$Te$_3$ and Bi$_2$Se$_3$ to be similar and in general in agreement with expectations from density functional theory. We establish a methodology that quantifies the mode-specific electron-phonon coupling experimentally, allowing detailed comparison to theory. Our results shed light on fundamental processes in topological insulators involving electron-phonon coupling. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.12132v1-abstract-full').style.display = 'none'; document.getElementById('2307.12132v1-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 July, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2023. </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> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2201.10769">arXiv:2201.10769</a> <span> [<a href="https://arxiv.org/pdf/2201.10769">pdf</a>, <a href="https://arxiv.org/format/2201.10769">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.129.127601">10.1103/PhysRevLett.129.127601 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Ultrafast Suppression of the Ferroelectric Instability in KTaO$_3$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Krapivin%2C+V">Viktor Krapivin</a>, <a href="/search/cond-mat?searchtype=author&query=Gu%2C+M">Mingqiang Gu</a>, <a href="/search/cond-mat?searchtype=author&query=Hickox-Young%2C+D">D. Hickox-Young</a>, <a href="/search/cond-mat?searchtype=author&query=Teitelbaum%2C+S+W">S. W. Teitelbaum</a>, <a href="/search/cond-mat?searchtype=author&query=Huang%2C+Y">Y. Huang</a>, <a href="/search/cond-mat?searchtype=author&query=de+la+Pe%C3%B1a%2C+G">G. de la Pe帽a</a>, <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+D">D. Zhu</a>, <a href="/search/cond-mat?searchtype=author&query=Sirica%2C+N">N. Sirica</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+M+-">M. -C. Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Prasankumar%2C+R+P">R. P. Prasankumar</a>, <a href="/search/cond-mat?searchtype=author&query=Maznev%2C+A">A. Maznev</a>, <a href="/search/cond-mat?searchtype=author&query=Nelson%2C+K+A">K. A. Nelson</a>, <a href="/search/cond-mat?searchtype=author&query=Chollet%2C+M">M. Chollet</a>, <a href="/search/cond-mat?searchtype=author&query=Rondinelli%2C+J+M">James M. Rondinelli</a>, <a href="/search/cond-mat?searchtype=author&query=Reis%2C+D+A">D. A. Reis</a>, <a href="/search/cond-mat?searchtype=author&query=Trigo%2C+M">M. 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="2201.10769v1-abstract-short" style="display: inline;"> We use an x-ray free-electron laser to study the ultrafast lattice dynamics following above band-gap photoexcitation of the incipient ferroelectric potassium-tantalate, \kto. % We use ultrafast near-UV (central wavelength 266\,nm and 50 fs pulse duration) laser light to photoexcite charge carriers across the gap and probe the ultrafast lattice dynamics by recording the x-ray diffuse intensity th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.10769v1-abstract-full').style.display = 'inline'; document.getElementById('2201.10769v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2201.10769v1-abstract-full" style="display: none;"> We use an x-ray free-electron laser to study the ultrafast lattice dynamics following above band-gap photoexcitation of the incipient ferroelectric potassium-tantalate, \kto. % We use ultrafast near-UV (central wavelength 266\,nm and 50 fs pulse duration) laser light to photoexcite charge carriers across the gap and probe the ultrafast lattice dynamics by recording the x-ray diffuse intensity throughout multiple Brillouin zones using pulses from the Linac Coherent Light Source (LCLS) (central wavelength 1.3\,脜\, and $< 10$~fs pulse duration). We observe changes in the diffuse intensity that we conclude are associated with a hardening of the soft transverse optical and transverse acoustic phonon branches along $螕$ to $X$ and $螕$ to $M$. Using ground- and excited-state interatomic force constants from density functional theory (DFT) and assuming the phonon populations can be described by a time-dependent temperature, we fit the quasi-equilibrium thermal diffuse intensity to the experimental time-dependent intensity. We obtain the instantaneous lattice temperature and density of photoexcited charge carriers as a function of time delay. The DFT calculations demonstrate that photoexcitation transfers charge from oxygen $2p$ derived $蟺$-bonding orbitals to Ta $5d$ derived antibonding orbitals, further suppressing the ferroelectric instability and increasing the stability of the cubic, paraelectric structure. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.10769v1-abstract-full').style.display = 'none'; document.getElementById('2201.10769v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 129, 127601 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2011.07196">arXiv:2011.07196</a> <span> [<a href="https://arxiv.org/pdf/2011.07196">pdf</a>, <a href="https://arxiv.org/format/2011.07196">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.128.155301">10.1103/PhysRevLett.128.155301 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Direct Observation of Coherent Longitudinal and Shear Acoustic Phonons in TaAs Using Ultrafast X-ray Diffraction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Lee%2C+M">Min-Cheol Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Sirica%2C+N">N. Sirica</a>, <a href="/search/cond-mat?searchtype=author&query=Teitelbaum%2C+S+W">S. W. Teitelbaum</a>, <a href="/search/cond-mat?searchtype=author&query=Maznev%2C+A">A. Maznev</a>, <a href="/search/cond-mat?searchtype=author&query=Pezeril%2C+T">T. Pezeril</a>, <a href="/search/cond-mat?searchtype=author&query=Tutchton%2C+R">R. Tutchton</a>, <a href="/search/cond-mat?searchtype=author&query=Krapivin%2C+V">V. Krapivin</a>, <a href="/search/cond-mat?searchtype=author&query=de+la+Pena%2C+G+A">G. A. de la Pena</a>, <a href="/search/cond-mat?searchtype=author&query=Huang%2C+Y">Y. Huang</a>, <a href="/search/cond-mat?searchtype=author&query=Zhao%2C+L+X">L. X. Zhao</a>, <a href="/search/cond-mat?searchtype=author&query=Chen%2C+G+F">G. F. Chen</a>, <a href="/search/cond-mat?searchtype=author&query=Xu%2C+B">B. Xu</a>, <a href="/search/cond-mat?searchtype=author&query=Yang%2C+R">R. Yang</a>, <a href="/search/cond-mat?searchtype=author&query=Shi%2C+J">J. Shi</a>, <a href="/search/cond-mat?searchtype=author&query=Zhu%2C+J">J. Zhu</a>, <a href="/search/cond-mat?searchtype=author&query=Yarotski%2C+D+A">D. A. Yarotski</a>, <a href="/search/cond-mat?searchtype=author&query=Qiu%2C+X+G">X. G. Qiu</a>, <a href="/search/cond-mat?searchtype=author&query=Nelson%2C+K+A">K. A. Nelson</a>, <a href="/search/cond-mat?searchtype=author&query=Trigo%2C+M">M. Trigo</a>, <a href="/search/cond-mat?searchtype=author&query=Reis%2C+D+A">D. A. Reis</a>, <a href="/search/cond-mat?searchtype=author&query=Prasankumar%2C+R+P">R. P. Prasankumar</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="2011.07196v2-abstract-short" style="display: inline;"> Using femtosecond time-resolved X-ray diffraction, we investigated optically excited coherent acoustic phonons in the Weyl semimetal TaAs. The low symmetry of the (112) surface probed in our experiment enables the simultaneous excitation of longitudinal and shear acoustic modes, whose dispersion closely matches our simulations. We observed an asymmetry in the spectral lineshape of the longitudinal… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.07196v2-abstract-full').style.display = 'inline'; document.getElementById('2011.07196v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2011.07196v2-abstract-full" style="display: none;"> Using femtosecond time-resolved X-ray diffraction, we investigated optically excited coherent acoustic phonons in the Weyl semimetal TaAs. The low symmetry of the (112) surface probed in our experiment enables the simultaneous excitation of longitudinal and shear acoustic modes, whose dispersion closely matches our simulations. We observed an asymmetry in the spectral lineshape of the longitudinal mode that is notably absent from the shear mode, suggesting a time-dependent frequency chirp that is likely driven by photoinduced carrier diffusion. We argue on the basis of symmetry that these acoustic deformations can transiently alter the electronic structure near the Weyl points and support this with model calculations. Our study underscores the benefit of using off-axis crystal orientations when optically exciting acoustic deformations in topological semimetals, allowing one to transiently change their crystal and electronic structures. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.07196v2-abstract-full').style.display = 'none'; document.getElementById('2011.07196v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 February, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 13 November, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 4 figures for manuscript, and 15 pages and 11 figures for supplemental materials</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> LA-UR-20-29013 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 128, 155301 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1608.01748">arXiv:1608.01748</a> <span> [<a href="https://arxiv.org/pdf/1608.01748">pdf</a>, <a href="https://arxiv.org/format/1608.01748">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.117.227601">10.1103/PhysRevLett.117.227601 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Analogy between the "Hidden Order" and the Orbital Antiferromagnetism in URu$_{2-x}$Fe$_x$Si$_2$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Kung%2C+H+-">H. -H. Kung</a>, <a href="/search/cond-mat?searchtype=author&query=Ran%2C+S">S. Ran</a>, <a href="/search/cond-mat?searchtype=author&query=Kanchanavatee%2C+N">N. Kanchanavatee</a>, <a href="/search/cond-mat?searchtype=author&query=Krapivin%2C+V">V. Krapivin</a>, <a href="/search/cond-mat?searchtype=author&query=Lee%2C+A">A. Lee</a>, <a href="/search/cond-mat?searchtype=author&query=Mydosh%2C+J+A">J. A. Mydosh</a>, <a href="/search/cond-mat?searchtype=author&query=Haule%2C+K">K. Haule</a>, <a href="/search/cond-mat?searchtype=author&query=Maple%2C+M+B">M. B. Maple</a>, <a href="/search/cond-mat?searchtype=author&query=Blumberg%2C+G">G. Blumberg</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="1608.01748v2-abstract-short" style="display: inline;"> We study URu$_{2-x}$Fe$_x$Si$_2$, in which two types of staggered phases compete at low temperature as the iron concentration $x$ is varied: the nonmagnetic "hidden order" (HO) phase below the critical concentration $x_c$, and unconventional antiferromagnetic (AF) phase above $x_c$. By using polarization resolved Raman spectroscopy, we detect a collective mode of pseudovector-like $A_{2g}$ symmetr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1608.01748v2-abstract-full').style.display = 'inline'; document.getElementById('1608.01748v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1608.01748v2-abstract-full" style="display: none;"> We study URu$_{2-x}$Fe$_x$Si$_2$, in which two types of staggered phases compete at low temperature as the iron concentration $x$ is varied: the nonmagnetic "hidden order" (HO) phase below the critical concentration $x_c$, and unconventional antiferromagnetic (AF) phase above $x_c$. By using polarization resolved Raman spectroscopy, we detect a collective mode of pseudovector-like $A_{2g}$ symmetry whose energy continuously evolves with increasing $x$; it monotonically decreases in the HO phase until it vanishes at $x=x_c$, and then reappears with increasing energy in the AF phase. The mode's evolution provides direct evidence for unified order parameter for both nonmagnetic and magnetic phases arising from the orbital degrees-of-freedom of the uranium-5$f$ electrons. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1608.01748v2-abstract-full').style.display = 'none'; document.getElementById('1608.01748v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 November, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 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">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 117, 227601 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1601.02040">arXiv:1601.02040</a> <span> [<a href="https://arxiv.org/pdf/1601.02040">pdf</a>, <a href="https://arxiv.org/format/1601.02040">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.116.196401">10.1103/PhysRevLett.116.196401 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Discovery of unconventional charge density wave at the surface of K0.9Mo6O17 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Mou%2C+D">Daixiang Mou</a>, <a href="/search/cond-mat?searchtype=author&query=Sapkota%2C+A">Aashish Sapkota</a>, <a href="/search/cond-mat?searchtype=author&query=Kung%2C+H+-">H. -H. Kung</a>, <a href="/search/cond-mat?searchtype=author&query=Krapivin%2C+V">Viktor Krapivin</a>, <a href="/search/cond-mat?searchtype=author&query=Wu%2C+Y">Yun Wu</a>, <a href="/search/cond-mat?searchtype=author&query=Kreyssig%2C+A">A. Kreyssig</a>, <a href="/search/cond-mat?searchtype=author&query=Zhou%2C+X">Xingjiang Zhou</a>, <a href="/search/cond-mat?searchtype=author&query=Goldman%2C+A+I">A. I. Goldman</a>, <a href="/search/cond-mat?searchtype=author&query=Blumberg%2C+G">G. Blumberg</a>, <a href="/search/cond-mat?searchtype=author&query=Flint%2C+R">Rebecca Flint</a>, <a href="/search/cond-mat?searchtype=author&query=Kaminski%2C+A">Adam Kaminski</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="1601.02040v1-abstract-short" style="display: inline;"> We use Angle Resolved Photoemission Spectroscopy (ARPES), Raman spectroscopy, Low Energy Electron Diffraction (LEED) and x-ray scattering to reveal an unusual electronically mediated charge density wave (CDW) in K0.9Mo6O17. Not only does K0.9Mo6O17 lack signatures of electron-phonon coupling, but it also hosts an extraordinary surface CDW, with TS CDW =220 K nearly twice that of the bulk CDW, TB C… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1601.02040v1-abstract-full').style.display = 'inline'; document.getElementById('1601.02040v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1601.02040v1-abstract-full" style="display: none;"> We use Angle Resolved Photoemission Spectroscopy (ARPES), Raman spectroscopy, Low Energy Electron Diffraction (LEED) and x-ray scattering to reveal an unusual electronically mediated charge density wave (CDW) in K0.9Mo6O17. Not only does K0.9Mo6O17 lack signatures of electron-phonon coupling, but it also hosts an extraordinary surface CDW, with TS CDW =220 K nearly twice that of the bulk CDW, TB CDW =115 K. While the bulk CDW has a BCS-like gap of 12 meV, the surface gap is ten times larger and well in the strong coupling regime. Strong coupling behavior combined with the absence of signatures of strong electron-phonon coupling indicates that the CDW is likely mediated by electronic interactions enhanced by low dimensionality. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1601.02040v1-abstract-full').style.display = 'none'; document.getElementById('1601.02040v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 January, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 116, 196401 (2016) </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> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg> <a href="https://info.arxiv.org/help/contact.html"> Contact</a> </li> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>subscribe to arXiv mailings</title><desc>Click here to subscribe</desc><path d="M476 3.2L12.5 270.6c-18.1 10.4-15.8 35.6 2.2 43.2L121 358.4l287.3-253.2c5.5-4.9 13.3 2.6 8.6 8.3L176 407v80.5c0 23.6 28.5 32.9 42.5 15.8L282 426l124.6 52.2c14.2 6 30.4-2.9 33-18.2l72-432C515 7.8 493.3-6.8 476 3.2z"/></svg> <a href="https://info.arxiv.org/help/subscribe"> Subscribe</a> </li> </ul> </div> </div> </div>   <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/license/index.html">Copyright</a></li> <li><a href="https://info.arxiv.org/help/policies/privacy_policy.html">Privacy Policy</a></li> </ul> </div> <div class="column sorry-app-links"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/web_accessibility.html">Web Accessibility Assistance</a></li> <li> <p class="help"> <a class="a11y-main-link" href="https://status.arxiv.org" target="_blank">arXiv Operational Status <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 512" class="icon filter-dark_grey" role="presentation"><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"/></svg></a><br> Get status notifications via <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/email/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg>email</a> or <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/slack/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" class="icon filter-black" role="presentation"><path d="M94.12 315.1c0 25.9-21.16 47.06-47.06 47.06S0 341 0 315.1c0-25.9 21.16-47.06 47.06-47.06h47.06v47.06zm23.72 0c0-25.9 21.16-47.06 47.06-47.06s47.06 21.16 47.06 47.06v117.84c0 25.9-21.16 47.06-47.06 47.06s-47.06-21.16-47.06-47.06V315.1zm47.06-188.98c-25.9 0-47.06-21.16-47.06-47.06S139 32 164.9 32s47.06 21.16 47.06 47.06v47.06H164.9zm0 23.72c25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06H47.06C21.16 243.96 0 222.8 0 196.9s21.16-47.06 47.06-47.06H164.9zm188.98 47.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06h-47.06V196.9zm-23.72 0c0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06V79.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06V196.9zM283.1 385.88c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06v-47.06h47.06zm0-23.72c-25.9 0-47.06-21.16-47.06-47.06 0-25.9 21.16-47.06 47.06-47.06h117.84c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06H283.1z"/></svg>slack</a> </p> </li> </ul> </div> </div> </div>  </div> </footer> <script src="https://static.arxiv.org/static/base/1.0.0a5/js/member_acknowledgement.js"></script> </body> </html>

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