Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf

Ab Initio Path Integral Monte Carlo Results for the Dynamic Structure Factor of Correlated Electrons: From the Electron Liquid to Warm Dense Matter

Dornheim, T.; Groth, S.; Vorberger, J.; Bonitz, M.

The accurate description of electrons at extreme density and temperature is of paramount importance for, e.g., the understanding of astrophysical objects and inertial confinement fusion. In this context, the dynamic structure factor S(q,w) constitutes a key quantity as it is directly measured in X-ray Thomson (XRTS) scattering experiments and governs transport properties like the dynamic conductivity. In this work, we present the first ab initio results for S(q,w) 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,w).
In addition, we find that the so-called static approximation constitutes a promising opportunity to obtain high-quality data for S(q; !) over substantial parts of the warm dense matter regime.

Keywords: warm dense matter; quantum Monte Carlo; electron gas; dynamic structure factor; local field correction

Publ.-Id: 28425