Ab initio path-integral Monte Carlo results for the one-particle spectral function of the warm dense electron gas

Paul Hamann; Michael Bonitz; Jan Vorberger; Tobias Dornheim

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arXiv · 2601.14992

Ab initio path-integral Monte Carlo results for the one-particle spectral function of the warm dense electron gas

Paul Hamann·Michael Bonitz·Jan Vorberger·Tobias Dornheim

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Abstract

We compute quasi-exact \emph{ab initio} path-integral Monte Carlo results for the Matsubara Green's function of the uniform electron gas (UEG) at finite temperature over a broad range of coupling strengths ($r_s=1,\dots,10)$. This allows us to present approximation-free results for the static self-energy $\Sigma_\infty(p)$ and spectral function $A(p,\omega)$, and to benchmark previous approximate results for the UEG. In addition, our work opens up intriguing avenues to study the single-particle spectrum and density of states of real warm dense matter systems based on truly first principles.

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Paul Hamann, Michael Bonitz, Jan Vorberger, Tobias Dornheim. 2026-01-21. Ab initio path-integral Monte Carlo results for the one-particle spectral function of the warm dense electron gas. https://arxiv.org/abs/2601.14992

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