Nonlinear electronic density response of the ferromagnetic uniform electron gas at warm dense matter conditions

TL;DR

This paper presents new path integral Monte Carlo simulations to study the nonlinear electronic density response of a ferromagnetic electron gas under warm dense matter conditions, highlighting the impact of spin effects.

Contribution

It extends previous work by including spin effects in the nonlinear response of the warm dense electron gas using extensive PIMC simulations.

Findings

Quantifies the impact of spin effects on nonlinear density response.

Provides ab initio data for ferromagnetic electron gases under warm dense conditions.

Enhances understanding of the uniform electron gas as a fundamental model.

Abstract

In a recent Letter [T.~Dornheim \emph{et al.}, Phys.~Rev.~Lett.~\textbf{125}, 085001 (2020)], we have presented the first \emph{ab initio} results for the nonlinear density response of electrons in the warm dense matter regime. In the present work, we extend these efforts by carrying out extensive new path integral Monte Carlo (PIMC) simulations of a \emph{ferromagnetic} electron gas that is subject to an external harmonic perturbation. This allows us to unambiguously quantify the impact of spin-effects on the nonlinear density response of the warm dense electron gas. In addition to their utility for the description of warm dense matter in an external magnetic field, our results further advance our current understanding of the uniform electron gas as a fundamental model system, which is important in its own right.