Zeeman splitting in ballistic hole quantum wires
R. Danneau, O. Klochan, W. R. Clarke, L.H. Ho, A. P. Micolich, M. Y., Simmons, A. R. Hamilton, M. Pepper, D. A. Ritchie, U. Zuelicke
TL;DR
This study investigates the Zeeman splitting in ballistic hole quantum wires, revealing a strong anisotropy dependent on magnetic field orientation, highlighting the role of quantum confinement and spin-orbit coupling.
Contribution
It provides the first detailed experimental analysis of Zeeman splitting anisotropy in hole quantum wires with strong spin-orbit interaction.
Findings
Significant spin degeneracy lifting with in-plane magnetic field
No discernible spin-splitting when magnetic field is perpendicular
Quantum confinement influences spin-splitting behavior
Abstract
We have studied the Zeeman splitting in ballistic hole quantum wires formed in a (311)A quantum well by surface gate confinement. Transport measurements clearly show lifting of the spin degeneracy and crossings of the subbands when an in-plane magnetic field B is applied parallel to the wire. When B is oriented perpendicular to the wire, no spin-splitting is discernible up to B = 8.8 T. The observed large Zeeman splitting anisotropy in our hole quantum wires demonstrates the importance of quantum-confinement for spin-splitting in nanostructures with strong spin-orbit coupling.
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