Work

Dynamic Properties of the Warm Dense Uniform Electron Gas With the qSTLS Dielectric Scheme

Year: 2025

Type: article

Abstract: ABSTRACT The recently derived Fourier–Matsubara expansion of imaginary–time correlation functions comprises an exact result of linear response theory for finite‐temperature quantum many‐body systems. In its density–density version, the expansion facilitates systematic comparisons between quasi‐exact ab initio path integral Monte Carlo simulations and approximate dielectric formalism schemes at the level of the imaginary–time (density–density) correlation functions and the dynamic Matsubara local field corrections. On this theoretical basis, the dynamic properties of the quantum version of the Singwi–Tosi–Land–Sjölander scheme are analyzed for the paramagnetic warm dense uniform electron gas. The marginal improvement compared to the semi‐classical version of the Singwi–Tosi–Land–Sjölander scheme is attributed to the weak Matsubara order dependence of the approximate dynamic Matsubara local field correction. The evaluation of the ideal density response function at the non‐interacting occupation numbers is identified to constitute a general deficiency of the dielectric formalism, which calls for a reformulation in future works.

Source: Contributions to Plasma Physics

DOI: 10.1002/ctpp.70014

Authors: Panagiotis Tolias, Fotios Kalkavouras, Tobias Dornheim, Federico Lucco Castello

Institutions: KTH Royal Institute of Technology, Helmholtz-Zentrum Dresden-Rossendorf, Center for Advanced Systems Understanding

Language: English

Topic: Dust and Plasma Wave Phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $2,930

Funders: European Commission, Bundesministerium für Bildung und Forschung, Technische Universität Dresden, H2020 European Research Council