Quantum Hall Effect in a Two-Dimensional Electron System Bent by 90 Degrees

TL;DR

This paper reports the fabrication and characterization of a novel two-dimensional electron system bent at a 90-degree corner, demonstrating a new quantum Hall edge geometry consistent with Landauer-Buttiker theory.

Contribution

It introduces a new fabrication technique for a bent 2D electron system and confirms a novel quantum Hall edge configuration using standard theoretical models.

Findings

Successful fabrication of a 90-degree corner 2D electron system

Quantum Hall edge channels are well described by Landauer-Buttiker theory in this geometry

Edge channel equilibration observed at various filling factors

Abstract

Using a new MBE growth technique, we fabricate a two-dimensional electron system which is bent around an atomically sharp 90 degree corner. In the quantum Hall regime under tilted magnetic fields, we can measure equilibration between both co- and counter-propagating edge channels of arbitrary filling factor ratio. We present here 4-point magnetotransport characterization of the corner junction with filling factor combinations which can all be explained using the standard Landauer-Buttiker edge channel picture. The success of this description confirms the realization of a new type of quantum Hall edge geometry.