Magnetotransport in C-doped AlGaAs heterostructures

TL;DR

This study investigates high-quality C-doped AlGaAs heterostructures using low-temperature magnetotransport to analyze quantum Hall effects and determine hole properties in spin-split subbands.

Contribution

It provides detailed measurements of hole densities, effective masses, and mobilities in C-doped AlGaAs heterostructures, revealing quantum Hall features and spin-split subband characteristics.

Findings

Observation of fractional quantum Hall effect features

High-resolution Shubnikov-de Haas oscillations

Determination of hole densities and effective masses

Abstract

High-quality C-doped p-type AlGaAs heterostructures with mobilities exceeding 150 000 cm$^2$/Vs are investigated by low-temperature magnetotransport experiments. We find features of the fractional quantum Hall effect as well as a highly resolved Shubnikov-de Haas oscillations at low magnetic fields. This allows us to determine the densities, effective masses and mobilities of the holes populating the spin-split subbands arising from the lack of inversion symmetry in these structures.