Tunable and direction-dependent group velocities in topologically protected edge states

TL;DR

This paper proposes utilizing topologically protected edge states to achieve highly tunable, direction-dependent group velocities, enabling advanced applications like delay lines and interference devices with robust performance.

Contribution

It introduces a method to realize and tune strongly direction-dependent group velocities in topological edge states, expanding their potential applications.

Findings

Direction-dependent group velocities can be realized in topological edge states.

Group velocities can be tuned over orders of magnitude.

Potential for robust delay lines and interference devices.

Abstract

Topological effects continue to fascinate physicists since more than three decades. One of their main applications are high-precision measurements of the resistivity. We propose to make also use of the spatially separated edge states. It is possible to realize strongly direction-dependent group velocities. They can also be tuned over orders of magnitude so that robust delay lines and interference devices are within reach.