Two of the most influential ideas developed by Richard Feynman are the Feynman diagram
technique and his variational approach. Here we show that combining both, and introducing …

The effective electron-electron interaction in electron gas depends on both the density and
spin local field factors. Variational diagrammatic quantum Monte Carlo calculations of the …

We discuss the methodology of quantum Monte Carlo calculations of the effective mass
based on the static self-energy Σ (k, 0). We then use variational Monte Carlo calculations of …

We calculate the off-diagonal density matrix of the homogeneous electron gas at zero
temperature<? format?> using unbiased reptation Monte Carlo calculations for various …

According to Landau's Fermi liquid theory, the main properties of the quasiparticle
excitations of an electron gas are embodied in the effective mass m*, which determines the …

Diagrammatic perturbation theory is a powerful tool for the investigation of interacting many-
body systems, the self-energy operator Σ encoding all the variety of scattering processes. In …

We calculate the single-particle excitation spectrum and the Landau liquid parameters for
the archetypal model of solids, the three-dimensional uniform electron gas, with the …

The quasiparticle effective mass $ m^\ast $ of interacting electrons is a fundamental quantity
in the Fermi liquid theory. However, the precise value of the effective mass of uniform …

Based on a nonperturbative scheme to determine the self-energy Σ (k, i ω n) with
automatically satisfying the Ward identity and the total-momentum conservation law, a fully …

A few approximate schemes to solve the Hedin equations self-consistently introduced in
Phys. Rev. B 94, 155101 (2016) 1098-0121 10.1103/PhysRevB. 94.155101 are explored …