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P: Fachverband Plasmaphysik
P 5: Poster I
P 5.3: Poster
Dienstag, 31. August 2021, 14:00–16:00, P
Ab Initio Plasmon Dispersion of the Warm Dense Electron Gas — •Paul Hamann1, Tobias Dornheim2, Jan Vorberger3, Zhandos Moldabekov2, and Michael Bonitz1 — 1Christian-Albrechts-Universität zu Kiel, Germany — 2Center for Advanced Systems Understanding, Görlitz, Germany — 3Helmholtz-Zentrum Dresden Rossendorf, Germany
The plasmon dispersion ω(q) and damping γ(q) contain important information on the state of warm dense matter. On the other hand, x-ray Thomson scattering (XRTS) experiments provide accurate data for the dynamic structure factor S(q, ω) that is directly linked to the plasmon spectrum [1]. However, details of this link depend on the quality of the theoretical model for the dielectric function. Here we present the first ab initio data for the dielectric function that is obtained by quantum Monte Carlo simulations [2]. This allows us to obtain high quality results for ω(q) and γ(q) of the electron component at warm dense matter conditions that differ significantly from previous models. Second, we critically analyze the commonly used weak damping approximation for the dispersion and improve it by performing the analytic continuation of the retarded dielectric function. This yields results that apply at strong damping and large wave numbers as well, which is the basis for a more accurate comparison with XRTS experiments [3].
[1] Glenzer et al., Phys. Rev. Lett.98, 065002 (2007) [2] Dornheim et al., Phys. Rev. Lett.121, 255001 (2018) [3] Hamann et al., Contrib. Plasma Phys.60, e202000147 (2020)