Optical conductivity of warm dense matter in wide frequency range within quantum statistical and kinetic approach

TL;DR

This paper investigates the optical conductivity of warm dense matter across a wide frequency spectrum using quantum statistical and kinetic methods, comparing various approaches and validating sum rules and relations.

Contribution

It provides a comprehensive comparison of dielectric function approaches and analyzes their applicability to different frequency regimes in warm dense matter.

Findings

Validated sum rules and Kramers-Kronig relations for the models

Analyzed high-frequency inverse bremsstrahlung effects

Discussed low-frequency dc conductivity in plasmas

Abstract

Fundamental properties of warm dense matter are described by the dielectric function, which gives access to the frequency-dependent electrical conductivity, absorption, emission and scattering of radiation, charged particles stopping and further macroscopic properties. Different approaches to the dielectric function and the related dynamical collision frequency are compared in a wide frequency range. The high-frequency limit describing inverse bremsstrahlung and the low-frequency limit of the dc conductivity are considered. Sum rules and Kramers-Kronig relation are checked for the generalized linear response theory and the standard approach following kinetic theory. The results are discussed in application to aluminum, xenon and argon plasmas.