Separately contacted edge states at high imbalance in the integer and fractional quantum Hall effect regime

TL;DR

This review discusses experimental studies of inter-edge-state transport at high imbalance in quantum Hall systems, revealing new insights into edge structure and excitations in both integer and fractional regimes.

Contribution

It introduces a specialized geometry for I-V spectroscopy of individual edge channels, providing detailed insights into edge phenomena in quantum Hall effects.

Findings

Observation of topological defect creation in integer quantum Hall effect

Detection of neutral collective modes in fractional regime

Enhanced understanding of local edge structure

Abstract

This review presents experimental results on the inter-edge-state transport in the quantum Hall effect, mostly obtained in the regime of high imbalance. The application of a special geometry makes it possible to perform I-V spectroscopy between individual edge channels in both the integer and the fractional regime. This makes it possible to study in detail a number of physical effects such as the creation of topological defects in the integer quantum Hall effect and neutral collective modes excitation in fractional regime. The while many of the experimental findings are well explained within established theories of the quantum Hall effects, a number of observations give new insight into the local structure at the sample edge, which can serve as a starting point for further theoretical studies.