Compressibility of a two-dimensional hole gas in tilted magnetic field

TL;DR

This study investigates how a tilted magnetic field influences the compressibility of a 2D hole gas in p-GaAs/AlGaAs heterostructures, revealing that the parallel magnetic component has negligible effects on spin splitting and disorder.

Contribution

It provides experimental evidence that the parallel magnetic field does not affect spin splitting or disorder in a 2D hole gas, indicating a near-zero g-factor in this configuration.

Findings

Parallel magnetic field does not affect spin splitting.

Disorder potential remains unchanged with parallel field.

g-factor is nearly zero in the parallel magnetic field.

Abstract

We have measured compressibility of a two-dimensional hole gas in p-GaAs/AlGaAs heterostructure, grown on a (100) surface, in the presence of a tilted magnetic field. It turns out that the parallel component of magnetic field affects neither the spin splitting nor the density of states. We conclude that: (a) g-factor in the parallel magnetic field is nearly zero in this system; and (b) the level of the disorder potential is not sensitive to the parallel component of the magnetic field.