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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/2411.06830">arXiv:2411.06830</a> <span> [<a href="https://arxiv.org/pdf/2411.06830">pdf</a>, <a href="https://arxiv.org/format/2411.06830">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> </div> </div> <p class="title is-5 mathjax"> Towards Model-free Temperature Diagnostics of Warm Dense Matter from Multiple Scattering Angles </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Bellenbaum%2C+H+M">Hannah M. Bellenbaum</a>, <a href="/search/physics?searchtype=author&query=Bachmann%2C+B">Benjamin Bachmann</a>, <a href="/search/physics?searchtype=author&query=Kraus%2C+D">Dominik Kraus</a>, <a href="/search/physics?searchtype=author&query=Gawne%2C+T">Thomas Gawne</a>, <a href="/search/physics?searchtype=author&query=B%C3%B6hme%2C+M+P">Maximilian P. B枚hme</a>, <a href="/search/physics?searchtype=author&query=D%C3%B6ppner%2C+T">Tilo D枚ppner</a>, <a href="/search/physics?searchtype=author&query=Fletcher%2C+L+B">Luke B. Fletcher</a>, <a href="/search/physics?searchtype=author&query=MacDonald%2C+M+J">Michael J. MacDonald</a>, <a href="/search/physics?searchtype=author&query=Moldabekov%2C+Z+A">Zhandos A. Moldabekov</a>, <a href="/search/physics?searchtype=author&query=Preston%2C+T+R">Thomas R. Preston</a>, <a href="/search/physics?searchtype=author&query=Vorberger%2C+J">Jan Vorberger</a>, <a href="/search/physics?searchtype=author&query=Dornheim%2C+T">Tobias Dornheim</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2411.06830v1-abstract-short" style="display: inline;"> Warm dense matter (WDM) plays an important role in astrophysical objects and technological applications, but the rigorous diagnostics of corresponding experiments is notoriously difficult. In this work, we present a model-free analysis of x-ray Thomson scattering (XRTS) measurements at multiple scattering angles. Specifically, we analyze scattering data that have been collected for isochorically h… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.06830v1-abstract-full').style.display = 'inline'; document.getElementById('2411.06830v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.06830v1-abstract-full" style="display: none;"> Warm dense matter (WDM) plays an important role in astrophysical objects and technological applications, but the rigorous diagnostics of corresponding experiments is notoriously difficult. In this work, we present a model-free analysis of x-ray Thomson scattering (XRTS) measurements at multiple scattering angles. Specifically, we analyze scattering data that have been collected for isochorically heated graphite at the Linac Coherent Light Source (LCLS). Overall, we find good consistency in the extracted temperature between small and large scattering angles, whereas possible signatures of non-equilibrium may be hidden by the source function, and by the available dynamic spectral range. The present proof-of-principle study directly points to improved experimental set-ups for equation-of-state measurements and for the model-free study of relaxation times. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.06830v1-abstract-full').style.display = 'none'; document.getElementById('2411.06830v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2410.01845">arXiv:2410.01845</a> <span> [<a href="https://arxiv.org/pdf/2410.01845">pdf</a>, <a href="https://arxiv.org/format/2410.01845">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> </div> </div> <p class="title is-5 mathjax"> Green's function perspective on the nonlinear density response of quantum many-body systems </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Vorberger%2C+J">Jan Vorberger</a>, <a href="/search/physics?searchtype=author&query=Dornheim%2C+T">Tobias Dornheim</a>, <a href="/search/physics?searchtype=author&query=B%C3%B6hme%2C+M+P">Maximilian P. B枚hme</a>, <a href="/search/physics?searchtype=author&query=Moldabekov%2C+Z">Zhandos Moldabekov</a>, <a href="/search/physics?searchtype=author&query=Tolias%2C+P">Panagiotis Tolias</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2410.01845v1-abstract-short" style="display: inline;"> We derive equations of motion for higher order density response functions using the theory of thermodynamic Green's functions. We also derive expressions for the higher order generalized dielectric functions and polarization functions. Moreover, we relate higher order response functions and higher order collision integrals within the Martin-Schwinger hierarchy. We expect our results to be highly r… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.01845v1-abstract-full').style.display = 'inline'; document.getElementById('2410.01845v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.01845v1-abstract-full" style="display: none;"> We derive equations of motion for higher order density response functions using the theory of thermodynamic Green's functions. We also derive expressions for the higher order generalized dielectric functions and polarization functions. Moreover, we relate higher order response functions and higher order collision integrals within the Martin-Schwinger hierarchy. We expect our results to be highly relevant to the study of a variety of quantum many-body systems such as matter under extreme temperatures, densities, and pressures. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.01845v1-abstract-full').style.display = 'none'; document.getElementById('2410.01845v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2409.08591">arXiv:2409.08591</a> <span> [<a href="https://arxiv.org/pdf/2409.08591">pdf</a>, <a href="https://arxiv.org/format/2409.08591">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> </div> </div> <p class="title is-5 mathjax"> Model-free Rayleigh weight from x-ray Thomson scattering measurements </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Dornheim%2C+T">Tobias Dornheim</a>, <a href="/search/physics?searchtype=author&query=Bellenbaum%2C+H+M">Hannah M. Bellenbaum</a>, <a href="/search/physics?searchtype=author&query=Bethkenhagen%2C+M">Mandy Bethkenhagen</a>, <a href="/search/physics?searchtype=author&query=Hansen%2C+S+B">Stephanie B. Hansen</a>, <a href="/search/physics?searchtype=author&query=B%C3%B6hme%2C+M+P">Maximilian P. B枚hme</a>, <a href="/search/physics?searchtype=author&query=D%C3%B6ppner%2C+T">Tilo D枚ppner</a>, <a href="/search/physics?searchtype=author&query=Fletcher%2C+L+B">Luke B. Fletcher</a>, <a href="/search/physics?searchtype=author&query=Gawne%2C+T">Thomas Gawne</a>, <a href="/search/physics?searchtype=author&query=Gericke%2C+D+O">Dirk O. Gericke</a>, <a href="/search/physics?searchtype=author&query=Hamel%2C+S">Sebastien Hamel</a>, <a href="/search/physics?searchtype=author&query=Kraus%2C+D">Dominik Kraus</a>, <a href="/search/physics?searchtype=author&query=MacDonald%2C+M+J">Michael J. MacDonald</a>, <a href="/search/physics?searchtype=author&query=Moldabekov%2C+Z+A">Zhandos A. Moldabekov</a>, <a href="/search/physics?searchtype=author&query=Preston%2C+T+R">Thomas R. Preston</a>, <a href="/search/physics?searchtype=author&query=Redmer%2C+R">Ronald Redmer</a>, <a href="/search/physics?searchtype=author&query=Sch%C3%B6rner%2C+M">Maximilian Sch枚rner</a>, <a href="/search/physics?searchtype=author&query=Schwalbe%2C+S">Sebastian Schwalbe</a>, <a href="/search/physics?searchtype=author&query=Tolias%2C+P">Panagiotis Tolias</a>, <a href="/search/physics?searchtype=author&query=Vorberger%2C+J">Jan Vorberger</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2409.08591v1-abstract-short" style="display: inline;"> X-ray Thomson scattering (XRTS) has emerged as a powerful tool for the diagnostics of matter under extreme conditions. In principle, it gives one access to important system parameters such as the temperature, density, and ionization state, but the interpretation of the measured XRTS intensity usually relies on theoretical models and approximations. In this work, we show that it is possible to extr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.08591v1-abstract-full').style.display = 'inline'; document.getElementById('2409.08591v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.08591v1-abstract-full" style="display: none;"> X-ray Thomson scattering (XRTS) has emerged as a powerful tool for the diagnostics of matter under extreme conditions. In principle, it gives one access to important system parameters such as the temperature, density, and ionization state, but the interpretation of the measured XRTS intensity usually relies on theoretical models and approximations. In this work, we show that it is possible to extract the Rayleigh weight -- a key property that describes the electronic localization around the ions -- directly from the experimental data without the need for any model calculations or simulations. As a practical application, we consider an experimental measurement of strongly compressed Be at the National Ignition Facility (NIF) [D枚ppner \emph{et al.}, \textit{Nature} \textbf{618}, 270-275 (2023)]. In addition to being interesting in their own right, our results will open up new avenues for diagnostics from \emph{ab initio} simulations, help to further constrain existing chemical models, and constitute a rigorous benchmark for theory and simulations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.08591v1-abstract-full').style.display = 'none'; document.getElementById('2409.08591v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2306.17653">arXiv:2306.17653</a> <span> [<a href="https://arxiv.org/pdf/2306.17653">pdf</a>, <a href="https://arxiv.org/format/2306.17653">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> </div> </div> <p class="title is-5 mathjax"> Evidence of free-bound transitions in warm dense matter and their impact on equation-of-state measurements </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=B%C3%B6hme%2C+M+P">Maximilian P. B枚hme</a>, <a href="/search/physics?searchtype=author&query=Fletcher%2C+L+B">Luke B. Fletcher</a>, <a href="/search/physics?searchtype=author&query=D%C3%B6ppner%2C+T">Tilo D枚ppner</a>, <a href="/search/physics?searchtype=author&query=Kraus%2C+D">Dominik Kraus</a>, <a href="/search/physics?searchtype=author&query=Baczewski%2C+A+D">Andrew D. Baczewski</a>, <a href="/search/physics?searchtype=author&query=Preston%2C+T+R">Thomas R. Preston</a>, <a href="/search/physics?searchtype=author&query=MacDonald%2C+M+J">Michael J. MacDonald</a>, <a href="/search/physics?searchtype=author&query=Graziani%2C+F+R">Frank R. Graziani</a>, <a href="/search/physics?searchtype=author&query=Moldabekov%2C+Z+A">Zhandos A. Moldabekov</a>, <a href="/search/physics?searchtype=author&query=Vorberger%2C+J">Jan Vorberger</a>, <a href="/search/physics?searchtype=author&query=Dornheim%2C+T">Tobias Dornheim</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="2306.17653v1-abstract-short" style="display: inline;"> Warm dense matter (WDM) is now routinely created and probed in laboratories around the world, providing unprecedented insights into conditions achieved in stellar atmospheres, planetary interiors, and inertial confinement fusion experiments. However, the interpretation of these experiments is often filtered through models with systematic errors that are difficult to quantify. Due to the simultaneo… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.17653v1-abstract-full').style.display = 'inline'; document.getElementById('2306.17653v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2306.17653v1-abstract-full" style="display: none;"> Warm dense matter (WDM) is now routinely created and probed in laboratories around the world, providing unprecedented insights into conditions achieved in stellar atmospheres, planetary interiors, and inertial confinement fusion experiments. However, the interpretation of these experiments is often filtered through models with systematic errors that are difficult to quantify. Due to the simultaneous presence of quantum degeneracy and thermal excitation, processes in which free electrons are de-excited into thermally unoccupied bound states transferring momentum and energy to a scattered x-ray photon become viable. Here we show that such free-bound transitions are a particular feature of WDM and vanish in the limits of cold and hot temperatures. The inclusion of these processes into the analysis of recent X-ray Thomson Scattering experiments on WDM at the National Ignition Facility and the Linac Coherent Light Source significantly improves model fits, indicating that free-bound transitions have been observed without previously being identified. This interpretation is corroborated by agreement with a recently developed model-free thermometry technique and presents an important step for precisely characterizing and understanding the complex WDM state of matter. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.17653v1-abstract-full').style.display = 'none'; document.getElementById('2306.17653v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2305.15305">arXiv:2305.15305</a> <span> [<a href="https://arxiv.org/pdf/2305.15305">pdf</a>, <a href="https://arxiv.org/format/2305.15305">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> X-ray Thomson scattering absolute intensity from the f-sum rule in the imaginary-time domain </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Dornheim%2C+T">Tobias Dornheim</a>, <a href="/search/physics?searchtype=author&query=D%C3%B6ppner%2C+T">Tilo D枚ppner</a>, <a href="/search/physics?searchtype=author&query=Baczewski%2C+A+D">Andrew D. Baczewski</a>, <a href="/search/physics?searchtype=author&query=Tolias%2C+P">Panagiotis Tolias</a>, <a href="/search/physics?searchtype=author&query=B%C3%B6hme%2C+M+P">Maximilian P. B枚hme</a>, <a href="/search/physics?searchtype=author&query=Moldabekov%2C+Z+A">Zhandos A. Moldabekov</a>, <a href="/search/physics?searchtype=author&query=Gawne%2C+T">Thomas Gawne</a>, <a href="/search/physics?searchtype=author&query=Ranjan%2C+D">Divyanshu Ranjan</a>, <a href="/search/physics?searchtype=author&query=Chapman%2C+D+A">David A. Chapman</a>, <a href="/search/physics?searchtype=author&query=MacDonald%2C+M+J">Michael J. MacDonald</a>, <a href="/search/physics?searchtype=author&query=Preston%2C+T+R">Thomas R. Preston</a>, <a href="/search/physics?searchtype=author&query=Kraus%2C+D">Dominik Kraus</a>, <a href="/search/physics?searchtype=author&query=Vorberger%2C+J">Jan Vorberger</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="2305.15305v2-abstract-short" style="display: inline;"> We present a formally exact and simulation-free approach for the normalization of X-ray Thomson scattering (XRTS) spectra based on the f-sum rule of the imaginary-time correlation function (ITCF). Our method works for any degree of collectivity, over a broad range of temperatures, and is applicable even in nonequilibrium situations. In addition to giving us model-free access to electronic correlat… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.15305v2-abstract-full').style.display = 'inline'; document.getElementById('2305.15305v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2305.15305v2-abstract-full" style="display: none;"> We present a formally exact and simulation-free approach for the normalization of X-ray Thomson scattering (XRTS) spectra based on the f-sum rule of the imaginary-time correlation function (ITCF). Our method works for any degree of collectivity, over a broad range of temperatures, and is applicable even in nonequilibrium situations. In addition to giving us model-free access to electronic correlations, this new approach opens up the intriguing possibility to extract a plethora of physical properties from the ITCF based on XRTS experiments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.15305v2-abstract-full').style.display = 'none'; document.getElementById('2305.15305v2-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> 4 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2302.11309">arXiv:2302.11309</a> <span> [<a href="https://arxiv.org/pdf/2302.11309">pdf</a>, <a href="https://arxiv.org/format/2302.11309">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> </div> </div> <p class="title is-5 mathjax"> Revealing Non-equilibrium and Relaxation in Warm Dense Matter </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Vorberger%2C+J">Jan Vorberger</a>, <a href="/search/physics?searchtype=author&query=Preston%2C+T+R">Thomas R. Preston</a>, <a href="/search/physics?searchtype=author&query=Medvedev%2C+N">Nikita Medvedev</a>, <a href="/search/physics?searchtype=author&query=B%C3%B6hme%2C+M+P">Maximilian P. B枚hme</a>, <a href="/search/physics?searchtype=author&query=Moldabekov%2C+Z+A">Zhandos A. Moldabekov</a>, <a href="/search/physics?searchtype=author&query=Kraus%2C+D">Dominik Kraus</a>, <a href="/search/physics?searchtype=author&query=Dornheim%2C+T">Tobias Dornheim</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="2302.11309v1-abstract-short" style="display: inline;"> Experiments creating extreme states of matter almost invariably create non-equilibrium states. These are very interesting in their own right but need to be understood even if the ultimate goal is to probe high-pressure or high-temperature equilibrium properties like the equation of state. Here, we report on the capabilities of the newly developed imaginary time correlation function (ITCF) techniqu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.11309v1-abstract-full').style.display = 'inline'; document.getElementById('2302.11309v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2302.11309v1-abstract-full" style="display: none;"> Experiments creating extreme states of matter almost invariably create non-equilibrium states. These are very interesting in their own right but need to be understood even if the ultimate goal is to probe high-pressure or high-temperature equilibrium properties like the equation of state. Here, we report on the capabilities of the newly developed imaginary time correlation function (ITCF) technique [1] to detect and quantify non-equilibrium in pump-probe experiments fielding time resolved x-ray scattering diagnostics. We find a high sensitivity of the ITCF even to a small fraction of non-equilibrium electrons in the Wigner distribution. The behavior of the ITCF technique is such that modern lasers and detectors should be able to trace the non-equilibrium relaxation from tens of femto-seconds to several 10s of picoseconds without the need for a model. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.11309v1-abstract-full').style.display = 'none'; document.getElementById('2302.11309v1-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 February, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2302.04822">arXiv:2302.04822</a> <span> [<a href="https://arxiv.org/pdf/2302.04822">pdf</a>, <a href="https://arxiv.org/format/2302.04822">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevResearch.5.023089">10.1103/PhysRevResearch.5.023089 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Linear-response time-dependent density functional theory approach to warm dense matter with adiabatic exchange--correlation kernels </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Moldabekov%2C+Z+A">Zhandos A. Moldabekov</a>, <a href="/search/physics?searchtype=author&query=Pavanello%2C+M">Michele Pavanello</a>, <a href="/search/physics?searchtype=author&query=Boehme%2C+M+P">Maximilian P. Boehme</a>, <a href="/search/physics?searchtype=author&query=Vorberger%2C+J">Jan Vorberger</a>, <a href="/search/physics?searchtype=author&query=Dornheim%2C+T">Tobias Dornheim</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="2302.04822v1-abstract-short" style="display: inline;"> We present a new methodology for the linear-response time-dependent density functional theory (LR-TDDFT) calculation of the dynamic density response function of warm dense matter in an adiabatic approximation that can be used with any available exchange-correlation (XC) functional across Jacob's Ladder and across temperature regimes. The main novelty of the presented approach is that it can go bey… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.04822v1-abstract-full').style.display = 'inline'; document.getElementById('2302.04822v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2302.04822v1-abstract-full" style="display: none;"> We present a new methodology for the linear-response time-dependent density functional theory (LR-TDDFT) calculation of the dynamic density response function of warm dense matter in an adiabatic approximation that can be used with any available exchange-correlation (XC) functional across Jacob's Ladder and across temperature regimes. The main novelty of the presented approach is that it can go beyond the adiabatic local density approximation (ALDA) and generalized LDA (AGGA) while preserving the self-consistence between the Kohn-Sham (KS) response function and adiabatic XC kernel for extended systems. The key ingredient for the presented method is the combination of the adiabatic XC kernel from the direct perturbation approach with the macroscopic dynamic KS response from the standard LR-TDDFT method using KS orbitals. We demonstrate the application of the method for the example of warm dense hydrogen, for which we perform a detailed analysis of the KS density response function, the RPA result, the total density response function and of the adiabatic XC kernel. The analysis is performed using LDA, GGA, and meta-GGA level approximations for the XC effects. The presented method is directly applicable to disordered systems such as liquid metals, warm dense matter, and dense plasmas. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.04822v1-abstract-full').style.display = 'none'; document.getElementById('2302.04822v1-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 February, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Research 5, 023089 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2212.08326">arXiv:2212.08326</a> <span> [<a href="https://arxiv.org/pdf/2212.08326">pdf</a>, <a href="https://arxiv.org/format/2212.08326">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-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/10.1063/5.0138955">10.1063/5.0138955 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Electronic Density Response of Warm Dense Matter </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Dornheim%2C+T">Tobias Dornheim</a>, <a href="/search/physics?searchtype=author&query=Moldabekov%2C+Z+A">Zhandos A. Moldabekov</a>, <a href="/search/physics?searchtype=author&query=Ramakrishna%2C+K">Kushal Ramakrishna</a>, <a href="/search/physics?searchtype=author&query=Tolias%2C+P">Panagiotis Tolias</a>, <a href="/search/physics?searchtype=author&query=Baczewski%2C+A+D">Andrew D. Baczewski</a>, <a href="/search/physics?searchtype=author&query=Kraus%2C+D">Dominik Kraus</a>, <a href="/search/physics?searchtype=author&query=Preston%2C+T+R">Thomas R. Preston</a>, <a href="/search/physics?searchtype=author&query=Chapman%2C+D+A">David A. Chapman</a>, <a href="/search/physics?searchtype=author&query=B%C3%B6hme%2C+M+P">Maximilian P. B枚hme</a>, <a href="/search/physics?searchtype=author&query=D%C3%B6ppner%2C+T">Tilo D枚ppner</a>, <a href="/search/physics?searchtype=author&query=Graziani%2C+F">Frank Graziani</a>, <a href="/search/physics?searchtype=author&query=Bonitz%2C+M">Michael Bonitz</a>, <a href="/search/physics?searchtype=author&query=Cangi%2C+A">Attila Cangi</a>, <a href="/search/physics?searchtype=author&query=Vorberger%2C+J">Jan Vorberger</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="2212.08326v2-abstract-short" style="display: inline;"> Matter at extreme temperatures and pressures -- commonly known as warm dense matter (WDM) in the literature -- is ubiquitous throughout our Universe and occurs in a number of astrophysical objects such as giant planet interiors and brown dwarfs. Moreover, WDM is very important for technological applications such as inertial confinement fusion, and is realized in the laboratory using different tech… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.08326v2-abstract-full').style.display = 'inline'; document.getElementById('2212.08326v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2212.08326v2-abstract-full" style="display: none;"> Matter at extreme temperatures and pressures -- commonly known as warm dense matter (WDM) in the literature -- is ubiquitous throughout our Universe and occurs in a number of astrophysical objects such as giant planet interiors and brown dwarfs. Moreover, WDM is very important for technological applications such as inertial confinement fusion, and is realized in the laboratory using different techniques. A particularly important property for the understanding of WDM is given by its electronic density response to an external perturbation. Such response properties are routinely probed in x-ray Thomson scattering (XRTS) experiments, and, in addition, are central for the theoretical description of WDM. In this work, we give an overview of a number of recent developments in this field. To this end, we summarize the relevant theoretical background, covering the regime of linear-response theory as well as nonlinear effects, the fully dynamic response and its static, time-independent limit, and the connection between density response properties and imaginary-time correlation functions (ITCF). In addition, we introduce the most important numerical simulation techniques including ab initio path integral Monte Carlo (PIMC) simulations and different thermal density functional theory (DFT) approaches. From a practical perspective, we present a variety of simulation results for different density response properties, covering the archetypal model of the uniform electron gas and realistic WDM systems such as hydrogen. Moreover, we show how the concept of ITCFs can be used to infer the temperature from XRTS measurements of arbitrarily complex systems without the need for any models or approximations. Finally, we outline a strategy for future developments based on the close interplay between simulations and experiments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2212.08326v2-abstract-full').style.display = 'none'; document.getElementById('2212.08326v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 December, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div 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