Disorder effect on the spin susceptibility of the two-dimensional one-valley electron gas

TL;DR

This paper investigates how uncorrelated disorder influences the spin susceptibility in a two-dimensional one-valley electron gas, showing that disorder enhances susceptibility and aligns well with experimental data within certain density ranges.

Contribution

It provides a perturbative analysis of disorder effects on spin susceptibility, extending quantum Monte Carlo predictions to real device conditions.

Findings

Disorder enhances spin susceptibility in 2D1V electron gases.

Predictions match experimental data in specific density regions.

Susceptibility diverges at certain disorder levels.

Abstract

Starting from the quantum Monte Carlo (QMC) prediction for the ground-state energy of a clean two-dimensional one-valley (2D1V) electron gas, we estimate the energy correction due to scattering sources present in actual devices such as AlAs quantum wells and GaAs heterostructures. We find that the effect of uncorrelated disorder, in the lowest (second) order in perturbation theory, is to enhance the spin susceptibility leading to its eventual divergence. In the density region where the Born approximation is able to reproduce the experimental mobility, the prediction for the spin susceptibility yielded by perturbation theory is in very good agreement with the available experimental evidence.