Aharonov-Bohm quantum rings in high-Q microcavities

TL;DR

This paper theoretically investigates how external electric and magnetic fields can be used to control the emission spectrum and coupling in a microcavity embedded with an Aharonov-Bohm quantum ring, enabling tunable quantum interactions.

Contribution

It introduces a method to tune quantum ring-microcavity coupling via magnetic flux and electric fields, providing new control mechanisms for quantum photonic systems.

Findings

Electric and magnetic fields enable control of emission spectra.

Resonance tuning occurs at half-integer magnetic flux quantum.

External fields allow precise manipulation of quantum coupling.

Abstract

A single-mode microcavity with an embedded Aharonov-Bohm quantum ring, which is pierced by a magnetic flux and subjected to a lateral electric field, is studied theoretically. It is shown that external electric and magnetic fields provide additional means of control of the emission spectrum of the system. In particular, when the magnetic flux through the quantum ring is equal to a half-integer number of the magnetic flux quantum, a small change in the lateral electric field allows tuning of the energy levels of the quantum ring into resonance with the microcavity mode providing an efficient way to control the quantum ring-microcavity coupling strength. Emission spectra of the system are calculated for several combinations of the applied magnetic and electric fields.