In-Plane Magnetoconductance Mapping of InSb Quantum Wells

TL;DR

This study uses in-plane magnetoconductance measurements of InSb quantum wells to analyze material disorder, g-factor anisotropy, and the effects of Zeeman splitting, demonstrating the value of multi-directional magnetotransport analysis.

Contribution

It introduces a method for mapping in-plane magnetoconductance in InSb quantum wells to extract anisotropic material properties and disorder effects.

Findings

Weak antilocalization is suppressed by in-plane magnetic fields.

Zeeman effect dominates WAL suppression.

Material disorder and g-factor show crystal-orientation dependence.

Abstract

In-plane magnetoconductance of InSb quantum wells (QW) containing a two dimensional electron gas (2DEG) is presented. Using a vector magnet, we created a magnetoconductance map which shows the suppression of weak antilocalization (WAL) as a function of applied field. By fitting the in-plane field response of the 2DEG, we estimate material disorder and g-factor as a function of crystal direction. The in-plane WAL suppression is found to be dominated by the Zeeman effect and to show a small crystal-orientation-dependent anistropy in disorder and g-factor. These measurements show the utility of multi-directional measurement of magnetoconductance in analyzing material properties.