Interplay between one-dimensional confinement and crystallographic anisotropy in ballistic hole quantum wires

TL;DR

This paper investigates how one-dimensional confinement and crystallographic anisotropy influence Zeeman splitting and g-factor behavior in ballistic hole quantum wires aligned along specific crystal axes, revealing complex anisotropic effects.

Contribution

It demonstrates the interplay between 1D confinement and 2D crystal anisotropy affecting g-factor anisotropy in ballistic hole quantum wires.

Findings

g-factor anisotropy explained by 1D confinement along [011]

Unusual non-monotonic g-factor behavior observed along [233]

Interplay between 1D confinement and 2D anisotropy affects Zeeman splitting

Abstract

We study the Zeeman splitting in induced ballistic 1D quantum wires aligned along the [233] and [011] axes of a high mobility (311)A undoped heterostructure. Our data shows that the g-factor anisotropy for magnetic fields applied along the high symmetry [011] direction can be explained by the 1D confinement only. However when the magnetic field is along [233] there is an interplay between the 1D confinement and 2D crystal anisotropy. This is highlighted for the [233] wire by an unusual non-monotonic behavior of the g-factor as the wire is made narrower.