Persistent currents in interacting Aharonov-Bohm interferometers and their enhancement by acoustic radiation

TL;DR

This paper derives a general expression for persistent currents in an Aharonov-Bohm interferometer with a quantum dot, showing how coupling to acoustic radiation can enhance the current.

Contribution

It provides a new analytical expression for persistent currents in non-interacting systems with a quantum dot and demonstrates enhancement via acoustic radiation coupling.

Findings

Persistent current expression derived for non-interacting systems with a quantum dot.

Coupling to phonons can enhance the magnitude of persistent currents.

Optimal acoustic source intensity leads to maximum current enhancement.

Abstract

We consider an Aharonov-Bohm interferometer, connected to two electronic reservoirs, with a quantum dot embedded on one of its arms. We find a general expression for the persistent current at steady state, valid for the case where the electronic system is free of interactions except on the dot. The result is used to derive the modification in the persistent current brought about by coupling the quantum dot to a phonon source. The magnitude of the persistent current is found to be enhanced in an appropriate range of the intensity of the acoustic source.