Spin-resolved density response of the warm dense electron gas

TL;DR

This paper provides new ab initio PIMC results for the spin-resolved density response of the warm dense electron gas, revealing complex electron interactions and offering benchmarks for future theoretical developments.

Contribution

It presents extensive, accurate PIMC data for the spin-resolved density response of the warm dense electron gas, enabling validation of existing models and advancing understanding of electron interactions.

Findings

Observation of effective electron-electron attraction at strong coupling.

Validation data for theoretical approximations of the density response.

Availability of PIMC results for benchmarking future methods.

Abstract

We present extensive new \emph{ab initio} path integral Monte Carlo (PIMC) results for the spin-resolved density response of the uniform electron gas (UEG) at warm dense matter conditions. This allows us to unambiguously assess the accuracy of previous theoretical approximations, thereby providing valuable new insights for the future development of dielectric schemes. From a physical perspective, we observe a nontrivial manifestation of an effective electron--electron attraction that emerges in the spin-offdiagonal static density response function at strong coupling, $r_s\gtrsim5$. All PIMC results are freely available online and can be used to benchmark new approximations and simulation schemes.