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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/2501.06752">arXiv:2501.06752</a> <span> [<a href="https://arxiv.org/pdf/2501.06752">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-ph</span> </div> </div> <p class="title is-5 mathjax"> The 2025 Roadmap to Ultrafast Dynamics: Frontiers of Theoretical and Computational Modelling </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Caruso%2C+F">Fabio Caruso</a>, <a href="/search/physics?searchtype=author&query=Sentef%2C+M+A">Michael A. Sentef</a>, <a href="/search/physics?searchtype=author&query=Attaccalite%2C+C">Claudio Attaccalite</a>, <a href="/search/physics?searchtype=author&query=Bonitz%2C+M">Michael Bonitz</a>, <a href="/search/physics?searchtype=author&query=Draxl%2C+C">Claudia Draxl</a>, <a href="/search/physics?searchtype=author&query=De+Giovannini%2C+U">Umberto De Giovannini</a>, <a href="/search/physics?searchtype=author&query=Eckstein%2C+M">Martin Eckstein</a>, <a href="/search/physics?searchtype=author&query=Ernstorfer%2C+R">Ralph Ernstorfer</a>, <a href="/search/physics?searchtype=author&query=Fechner%2C+M">Michael Fechner</a>, <a href="/search/physics?searchtype=author&query=Gr%C3%BCning%2C+M">Myrta Gr眉ning</a>, <a href="/search/physics?searchtype=author&query=H%C3%BCbener%2C+H">Hannes H眉bener</a>, <a href="/search/physics?searchtype=author&query=Joost%2C+J">Jan-Philip Joost</a>, <a href="/search/physics?searchtype=author&query=Juraschek%2C+D+M">Dominik M. Juraschek</a>, <a href="/search/physics?searchtype=author&query=Karrasch%2C+C">Christoph Karrasch</a>, <a href="/search/physics?searchtype=author&query=Kennes%2C+D+M">Dante Marvin Kennes</a>, <a href="/search/physics?searchtype=author&query=Latini%2C+S">Simone Latini</a>, <a href="/search/physics?searchtype=author&query=Lu%2C+I">I-Te Lu</a>, <a href="/search/physics?searchtype=author&query=Neufeld%2C+O">Ofer Neufeld</a>, <a href="/search/physics?searchtype=author&query=Perfetto%2C+E">Enrico Perfetto</a>, <a href="/search/physics?searchtype=author&query=Rettig%2C+L">Laurenz Rettig</a>, <a href="/search/physics?searchtype=author&query=Pela%2C+R+R">Ronaldo Rodrigues Pela</a>, <a href="/search/physics?searchtype=author&query=Rubio%2C+A">Angel Rubio</a>, <a href="/search/physics?searchtype=author&query=Rudzinski%2C+J+F">Joseph F. Rudzinski</a>, <a href="/search/physics?searchtype=author&query=Ruggenthaler%2C+M">Michael Ruggenthaler</a>, <a href="/search/physics?searchtype=author&query=Sangalli%2C+D">Davide Sangalli</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="2501.06752v1-abstract-short" style="display: inline;"> The exploration of ultrafast phenomena is a frontier of condensed matter research, where the interplay of theory, computation, and experiment is unveiling new opportunities for understanding and engineering quantum materials. With the advent of advanced experimental techniques and computational tools, it has become possible to probe and manipulate nonequilibrium processes at unprecedented temporal… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.06752v1-abstract-full').style.display = 'inline'; document.getElementById('2501.06752v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2501.06752v1-abstract-full" style="display: none;"> The exploration of ultrafast phenomena is a frontier of condensed matter research, where the interplay of theory, computation, and experiment is unveiling new opportunities for understanding and engineering quantum materials. With the advent of advanced experimental techniques and computational tools, it has become possible to probe and manipulate nonequilibrium processes at unprecedented temporal and spatial resolutions, providing insights into the dynamical behavior of matter under extreme conditions. These capabilities have the potential to revolutionize fields ranging from optoelectronics and quantum information to catalysis and energy storage. This Roadmap captures the collective progress and vision of leading researchers, addressing challenges and opportunities across key areas of ultrafast science. Contributions in this Roadmap span the development of ab initio methods for time-resolved spectroscopy, the dynamics of driven correlated systems, the engineering of materials in optical cavities, and the adoption of FAIR principles for data sharing and analysis. Together, these efforts highlight the interdisciplinary nature of ultrafast research and its reliance on cutting-edge methodologies, including quantum electrodynamical density-functional theory, correlated electronic structure methods, nonequilibrium Green's function approaches, quantum and ab initio simulations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.06752v1-abstract-full').style.display = 'none'; document.getElementById('2501.06752v1-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, 2025; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2025. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2405.12690">arXiv:2405.12690</a> <span> [<a href="https://arxiv.org/pdf/2405.12690">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> </div> </div> <p class="title is-5 mathjax"> Light induced magnetic order </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Jauk%2C+T">T. Jauk</a>, <a href="/search/physics?searchtype=author&query=Hampel%2C+H">H. Hampel</a>, <a href="/search/physics?searchtype=author&query=Walowski%2C+J">J. Walowski</a>, <a href="/search/physics?searchtype=author&query=Komatsu%2C+K">K. Komatsu</a>, <a href="/search/physics?searchtype=author&query=Kredl%2C+J">J. Kredl</a>, <a href="/search/physics?searchtype=author&query=Harris-Lee%2C+E+I">E. I. Harris-Lee</a>, <a href="/search/physics?searchtype=author&query=Dewhurst%2C+J+K">J. K. Dewhurst</a>, <a href="/search/physics?searchtype=author&query=M%C3%BCnzenberg%2C+M">M. M眉nzenberg</a>, <a href="/search/physics?searchtype=author&query=Shallcross%2C+S">S. Shallcross</a>, <a href="/search/physics?searchtype=author&query=Sharma%2C+S">S. Sharma</a>, <a href="/search/physics?searchtype=author&query=Schultze%2C+M">M. Schultze</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2405.12690v1-abstract-short" style="display: inline;"> Heat and disorder are opponents of magnetism. This fact, expressed in Curie's law established more than a century ago, holds even in the highly non-equilibrium interaction of ultra-intense laser pulses with magnetic matter. In contradiction to this, here we demonstrate that optical excitation of a ferromagnet can abrogate the link between temperature and order and observe 100 femtosecond class las… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.12690v1-abstract-full').style.display = 'inline'; document.getElementById('2405.12690v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2405.12690v1-abstract-full" style="display: none;"> Heat and disorder are opponents of magnetism. This fact, expressed in Curie's law established more than a century ago, holds even in the highly non-equilibrium interaction of ultra-intense laser pulses with magnetic matter. In contradiction to this, here we demonstrate that optical excitation of a ferromagnet can abrogate the link between temperature and order and observe 100 femtosecond class laser pulses to drive a reduction in spin entropy, concomitant to an increase in spin polarization and magnetic moment persisting after relaxation back to local charge equilibrium. This both establishes disorder as an unexpected resource for magnetic control at ultrafast times and, by the provision of a purely electronic mechanism that does not involve reconfiguration of the crystal lattice, suggests a novel scheme for spin-based signal processing and information storage significantly faster than current methodology. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.12690v1-abstract-full').style.display = 'none'; document.getElementById('2405.12690v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2207.11461">arXiv:2207.11461</a> <span> [<a href="https://arxiv.org/pdf/2207.11461">pdf</a>, <a href="https://arxiv.org/format/2207.11461">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.106.L060302">10.1103/PhysRevB.106.L060302 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Electronic origin of x-ray absorption peak shifts </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Shallcross%2C+S">S. Shallcross</a>, <a href="/search/physics?searchtype=author&query=Schmising%2C+C+v+K">C. v. Korff Schmising</a>, <a href="/search/physics?searchtype=author&query=Elliott%2C+P">P. Elliott</a>, <a href="/search/physics?searchtype=author&query=Eisebitt%2C+S">S. Eisebitt</a>, <a href="/search/physics?searchtype=author&query=Dewhurst%2C+J+K">J. K. Dewhurst</a>, <a href="/search/physics?searchtype=author&query=Sharma%2C+S">S. Sharma</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2207.11461v1-abstract-short" style="display: inline;"> Encoded in the transient x-ray absorption (XAS) and magnetic circular (MCD) response functions resides a wealth of information of the microscopic processes of ultrafast demagnetisation. Employing state of the art first principles dynamical simulations we show that the experimentally observed energy shift of the L3 XAS peak in Ni, and the absence of a corresponding shift in the dichroic MCD respons… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.11461v1-abstract-full').style.display = 'inline'; document.getElementById('2207.11461v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.11461v1-abstract-full" style="display: none;"> Encoded in the transient x-ray absorption (XAS) and magnetic circular (MCD) response functions resides a wealth of information of the microscopic processes of ultrafast demagnetisation. Employing state of the art first principles dynamical simulations we show that the experimentally observed energy shift of the L3 XAS peak in Ni, and the absence of a corresponding shift in the dichroic MCD response, can be explained in terms of laser induced changes in band occupation. Strikingly, we predict that for the same ultrashort pump pulse applied to Co the opposite effect will occur: a substantial shift upwards in energy of the MCD peaks will be accompanied by very small change in the position of XAS peaks, a fact we relate to the reduced $d$-band filling of Co that allows a greater energetic range above the Fermi energy into which charge can be excited. We also carefully elucidate the dependence of this effect on pump pulse parameters. These findings (i) establish a electronic origin for early time peak shifts in transient XAS and MCD spectroscopy and (ii) illustrate the rich information that may be extracted from transient response functions of the underlying dynamical system. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.11461v1-abstract-full').style.display = 'none'; document.getElementById('2207.11461v1-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 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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">4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.14286">arXiv:2203.14286</a> <span> [<a href="https://arxiv.org/pdf/2203.14286">pdf</a>, <a href="https://arxiv.org/format/2203.14286">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Valley control by linearly polarized laser pulses </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Sharma%2C+S">S. Sharma</a>, <a href="/search/physics?searchtype=author&query=Elliott%2C+P">P. Elliott</a>, <a href="/search/physics?searchtype=author&query=Shallcross%2C+S">S. Shallcross</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2203.14286v1-abstract-short" style="display: inline;"> Underpinning the field of "valleytronics" is the coupling of the helicity of circularly polarized light to the valley degree of freedom, and this remains the only known lightform to exhibit this remarkable effect. Here we show that on femtosecond time scales valley coupling is a much more general effect. We find that two time separated linearly polarized pulses allow almost complete control over v… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.14286v1-abstract-full').style.display = 'inline'; document.getElementById('2203.14286v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.14286v1-abstract-full" style="display: none;"> Underpinning the field of "valleytronics" is the coupling of the helicity of circularly polarized light to the valley degree of freedom, and this remains the only known lightform to exhibit this remarkable effect. Here we show that on femtosecond time scales valley coupling is a much more general effect. We find that two time separated linearly polarized pulses allow almost complete control over valley excitation, with the pulse time difference and polarization vectors emerging as key parameters for valley control. In contrast to the Berry curvature that underpins the effect for circularly polarized light, we demonstrate that a different phase structure drives this effect, with excitations during each linear pulse acquiring a valley discriminating phase involving the polarisation angle of linear light. Unimportant in a single linear pulse, for pairs of pulses these can constructively and destructively interfere. Employing state-of-the-art time dependent density function theory, we show that the effect is robust to the complexities of charge dynamics in a real material with the example of a transitional metal dichalcogenide. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.14286v1-abstract-full').style.display = 'none'; document.getElementById('2203.14286v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2012.03247">arXiv:2012.03247</a> <span> [<a href="https://arxiv.org/pdf/2012.03247">pdf</a>, <a href="https://arxiv.org/format/2012.03247">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> <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="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/10.1063/5.0076198">10.1063/5.0076198 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Ultrafast optical control over spin and momentum in solids </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Li%2C+Q+Z">Q. Z. Li</a>, <a href="/search/physics?searchtype=author&query=Shallcross%2C+S">S. Shallcross</a>, <a href="/search/physics?searchtype=author&query=Dewhurst%2C+J+K">J. K. Dewhurst</a>, <a href="/search/physics?searchtype=author&query=Sharma%2C+S">S. Sharma</a>, <a href="/search/physics?searchtype=author&query=Elliott%2C+P">P. Elliott</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="2012.03247v1-abstract-short" style="display: inline;"> The coupling of laser light to matter can exert sub-cycle coherent control over material properties, with optically induced currents and magnetism shown to be controllable on ultrafast femtosecond time scales. Here, by employing laser light consisting of both linear and circular pulses, we show that charge of specified spin and crystal momentum can be created with precision throughout the first Br… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.03247v1-abstract-full').style.display = 'inline'; document.getElementById('2012.03247v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2012.03247v1-abstract-full" style="display: none;"> The coupling of laser light to matter can exert sub-cycle coherent control over material properties, with optically induced currents and magnetism shown to be controllable on ultrafast femtosecond time scales. Here, by employing laser light consisting of both linear and circular pulses, we show that charge of specified spin and crystal momentum can be created with precision throughout the first Brillouin zone. Our hybrid pulses induce in a controlled way both adiabatic intraband motion as well as vertical interband excitation between valence and conduction bands, and require only a gapped spin split valley structure for their implementation. This scenario is commonly found in the 2d semi-conductors, and we demonstrate our approach with monolayer WSe$_2$. We thus establish a route from laser light to local control over excitations in reciprocal space, opening the way to the preparation of momenta specified excited states at ultrafast time scales. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.03247v1-abstract-full').style.display = 'none'; document.getElementById('2012.03247v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 December, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2020. </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 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