Quantized escape and formation of edge channels at high Landau levels

TL;DR

This paper investigates nonlocal resistance in high mobility 2D electron gases at high Landau levels, revealing dissipative edge transport and resonances linked to edge channel formation and escape, advancing understanding of quantum Hall edge phenomena.

Contribution

It demonstrates classical guiding effects at weak magnetic fields and identifies voltage-controlled resonances indicating edge channel dynamics in high Landau levels.

Findings

Strong nonlocal resistance at macroscopic distances

Dissipative edge transport modulated by voltage amplitude

Resonances indicating edge channel escape and formation

Abstract

We present nonlocal resistance measurements in an ultra high mobility two dimensional electron gas. Our experiments show that even at weak magnetic fields classical guiding along edges leads to a strong non local resistance on macroscopic distances. In this high Landau level regime the transport along edges is dissipative and can be controlled by the amplitude of the voltage drop along the edge. We report resonances in the nonlocal transport as a function of this voltage that are interpreted as escape and formation of edge channels.