Tunable signal velocity in the integer quantum Hall effect of tailored graphene

TL;DR

This paper demonstrates how to control the Fermi velocity of topological edge states in tailored graphene through external parameters, enabling tunable delay lines and interferometers for potential technological applications.

Contribution

It introduces a method to engineer the dispersion of topological edge states in graphene, allowing for adjustable signal velocities in quantum Hall regimes.

Findings

Edge state dispersions can be tuned via gate voltages.

Tunable delay lines and interferometers are feasible.

Control over signal velocity in topological systems is demonstrated.

Abstract

Topological properties in condensed matter physics are often claimed to be a fruitful resource for technical applications, but so far they only play a minor role in applications. Here we propose to put topological edge states to use in tailored graphene for Fermi velocity engineering. By tuning external control parameters such as gate voltages, the dispersions of the edge states regime are modified in a controllable way. This enables the realizations of devices such as tunable delay lines and interferometers with switchable delays.