Tunable optical Aharonov-Bohm effect in a semiconductor quantum ring

TL;DR

This paper demonstrates how an electric field can tune the Aharonov-Bohm effect in semiconductor quantum rings, enabling control over its strength and periodicity for both electrons and excitons.

Contribution

It introduces a method to modulate the AB effect in quantum rings via electric fields and analyzes the influence of strain on this phenomenon.

Findings

Electric field can switch wave functions between QD-like and ring-like.

The AB effect's strength and periodicity are tunable with electric fields.

Strain affects the potential and modifies the AB effect.

Abstract

By applying an electric field perpendicular to a semiconductor quantum ring we show that it is possible to modify the single particle wave function between quantum dot (QD)-like to ring-like. The constraints on the geometrical parameters of the quantum ring to realize such a transition are derived. With such a perpendicular electric field we are able to tune the Aharanov-Bohm (AB) effect for both single particles and for excitons. The tunability is in both the strength of the AB-effect as well as in its periodicity. We also investigate the strain induce potential inside the self assembled quantum ring and the effect of the strain on the AB effect.