Magnetotransport in two-dimensional electron gases on cylindrical surfaces

TL;DR

This paper reports on the fabrication and analysis of high-mobility 2D electron gases on cylindrical surfaces, revealing asymmetric quantum Hall effects and ballistic transport phenomena under varying magnetic fields.

Contribution

It introduces a novel cylindrical geometry for 2D electron gases, enabling new insights into magnetotransport behavior and quantum Hall asymmetry.

Findings

Asymmetric quantum Hall effect observed on cylindrical surfaces

Ballistic transport demonstrated in 8-micrometer-wide structures

Strain at the quantum well position characterized

Abstract

We have fabricated high-mobility, two-dimensional electron gases in a GaAs quantum well on cylindrical surfaces, which allows to investigate the magnetotransport behavior under varying magnetic fields along the current path. A strong asymmetry in the quantum Hall effect appears for measurements on both sides of the conductive path. We determined the strain at the position of the quantum well. We observe ballistic transport in 8-micrometers-wide collimating structures.