Effects of external radiation on biased Aharonov-Bohm rings

TL;DR

This paper analyzes how external radiation influences currents in a solid-state Aharonov-Bohm interferometer, considering interactions with bosonic environments and quantum dots, revealing controllable interference effects.

Contribution

It provides new analytical expressions for currents in an interferometer with quantum dot interactions under external radiation, including out-of-equilibrium bosonic effects.

Findings

External radiation modifies both circulating and transport currents.

Coupling to bosonic sources allows control over interference effects.

Theoretical expressions accommodate out-of-equilibrium bosonic environments.

Abstract

We consider the currents flowing in a solid-state interferometer under the effect of both an Aharonov-Bohm phase and a bias potential. Expressions are obtained for these currents, allowing for electronic or electron-boson interactions, which may take place solely on a quantum dot placed on one of the interferometer arms. The boson system can be out of equilibrium. The results are used to obtain the transport current through the interferometer, and the current circulating around it under the effect of the Aharonov-Bohm flux. The modifications of both currents, brought about by coupling the quantum dot to an incoherent sonic or electromagnetic source, are then analyzed. By choosing the appropriate range of the boson source intensity and its frequency, the magnitude of the interference-related terms of both currents can be controlled.