Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 17: Poster Session: Correlated Electrons 1

TT 17.39: Poster

Montag, 1. April 2019, 15:00–18:30, Poster D

Ab initio results for the dynamic structure factor of strongly correlated electrons — Simon Groth, Tobias Dornheim, •Jan-Philip Joost, and Michael Bonitz — ITAP, CAU Kiel, Leibnizstraße 15, 24229 Kiel

The accurate description of electrons at high density and finite temperature is of paramount importance for, e.g., the understanding of astrophysical objects and correlated materials. In this context, the dynamic structure factor S(q,ω) constitutes a key quantity as it is directly measured e.g. in X-ray Thomson scattering experiments. We have recently [1] obtained the first ab initio results for S(q,ω) by carrying out extensive path integral Monte Carlo simulations and developing a new method for the required analytic continuation, which is based on the stochastic sampling of the dynamic local field correction G(q,ω). A particularly interesting result is the confirmation of a negative plasmon dispersion in the correlated liquid regime. This extends our recent work on the ab initio thermodynamic results of the warm dense electron gas [2] to dynamic quantities. These results are compared with an independent approach that is based on nonequilibrium Green functions [3].
T. Dornheim, S. Groth, J. Vorberger, and M. Bonitz, Phys. Rev. Lett., in press, arxiv:1810.12776
T. Dornheim, S. Groth, and M. Bonitz, Phys. Reports 744, 1-86 (2018)
N.H. Kwong and M. Bonitz, Phys. Rev. Lett. 84, 1768 (2000)