Using a tunable quantum wire to measure the large out-of-plane spin splitting of quasi two-dimensional holes in a GaAs nanostructure

TL;DR

This paper reports a direct measurement of the large out-of-plane g-factor for quasi-2D holes in GaAs, using a tunable quantum wire, revealing values up to 5 and approaching theoretical predictions.

Contribution

It introduces a method to measure the out-of-plane g-factor in quasi-2D holes using a tunable quantum wire, providing experimental validation of theoretical predictions.

Findings

Measured g_perp up to 5 for quasi-2D holes

First direct measurement confirming large out-of-plane g-factor

Results approach the predicted value of 7.2 for heavy holes

Abstract

The out-of-plane g-factor g_perp for quasi-2D holes in a (100) GaAs heterostructure is studied using a variable width quantum wire. A direct measurement of the Zeeman splitting is performed in a magnetic field applied perpendicular to the 2D plane. We measure an out-of-plane g-factor up to g_perp = 5, which is larger than previous optical studies of g_perp, and is approaching the long predicted but never experimentally verified out-of-plane g-factor of 7.2 for heavy holes.