Effective tuning of unusual Aharonov-Bohm oscillations in a single quantum ring

TL;DR

This paper demonstrates that intense THz laser and in-plane electric fields can create and tune unusual Aharonov-Bohm oscillations in isotropic quantum rings, revealing a method to control their optical properties.

Contribution

It introduces a non-perturbative Floquet theory approach to show how external fields can effectively tune Aharonov-Bohm oscillations and optical properties in quantum rings.

Findings

Unusual Aharonov-Bohm oscillations are induced by intense THz laser and electric fields.

Electric field direction effectively tunes the oscillation amplitudes.

Optical properties can be controlled by electric field orientation.

Abstract

The simultaneous effect of intense THz laser and in-plane electric fields on Aharonov-Bohm effect in single isotropic quantum rings is investigated using the non-perturbative Floquet theory in high-frequency limit. It is shown that in isotropic quantum rings the intense THz laser and in-plane electric field create unusual Aharonov-Bohm oscillations. For fixed values of intense THz laser field parameter, the amplitudes of Aharonov-Bohm oscillations can be effectively tuned by changing the electric field direction. Furthermore, for fixed values of electric field strength and laser field parameter the intraband optical properties can be effectively tuned by changing the electric field direction. Thus, it can be argued that a circular QR in the intense THz laser field is equivalent to the anisotropic quantum ring, and the electric field direction effectively tunes the unusual Aharonov-Bohm oscillations and intraband optical properties of the ring.