Tunable dispersion of the edge states in the integer quantum Hall effect

TL;DR

This paper proposes modifications to quantum Hall effect samples enabling external tuning of edge state dispersion, opening new avenues for device applications like tunable delay lines and interferometers.

Contribution

It introduces a method to control Fermi velocity in quantum Hall edge states via external parameters, a novel approach for device tunability.

Findings

Fermi velocity can be tuned by gate voltages.

Modified samples allow control over edge state dispersion.

Potential for new quantum device applications.

Abstract

Topological aspects represent currently a boosting area in condensed matter physics. Yet there are very few suggestions for technical applications of topological phenomena. Still, the most important is the calibration of resistance standards by means of the integer quantum Hall effect. We propose modifications of samples displaying the integer quantum Hall effect which render the tunability of the Fermi velocity possible by external control parameters such as gate voltages. In this way, so far unexplored possibilities arise to realize devices such as tunable delay lines and interferometers.