Diffusion quantum Monte Carlo calculation of the quasiparticle effective mass of the two-dimensional homogeneous electron gas

TL;DR

This paper presents highly precise quantum Monte Carlo calculations of the quasiparticle effective mass in a two-dimensional homogeneous electron gas, improving accuracy and finite-size effect treatment over previous studies.

Contribution

It introduces a refined quantum Monte Carlo approach with reduced statistical errors and larger system sizes for better effective mass estimation.

Findings

Achieved smaller statistical error bars in calculations.

Improved finite-size effect treatment.

Extended system sizes compared to prior work.

Abstract

The quasiparticle effective mass is a key quantity in the physics of electron gases, describing the renormalization of the electron mass due to electron-electron interactions. Two-dimensional electron gases are of fundamental importance in semiconductor physics, and there have been numerous experimental and theoretical attempts to determine the quasiparticle effective mass in these systems. In this work we report quantum Monte Carlo results for the quasiparticle effective mass of a two-dimensional homogeneous electron gas. Our calculations differ from previous quantum Monte Carlo work in that much smaller statistical error bars have been achieved, allowing for an improved treatment of finite-size effects. In some cases we have also been able to use larger system sizes than previous calculations.