Controllable Continuous evolution of electronic states in a single quantum ring

TL;DR

This paper demonstrates that intense terahertz laser fields can controllably transform the electronic and optical properties of quantum rings, effectively making anisotropic rings behave like isotropic ones, with continuous evolution of their spectra.

Contribution

It introduces a method to use laser fields to induce a continuous transition from anisotropic to isotropic quantum rings, unifying their properties.

Findings

Laser fields create irregular AB oscillations in isotropic rings.

Intense laser fields restore isotropic properties in anisotropic rings.

Energy spectra and optical characteristics evolve continuously under laser influence.

Abstract

Intense terahertz laser field is shown to have a profound effect on the electronic and optical properties of quantum rings, where the isotropic and anisotropic quantum rings can now be treated on equal footing. We have demonstrated that in isotropic quantum rings the laser field creates irregular AB oscillations that are usually expected in anisotropic rings. Further, we have shown for the first time that intense laser fields can restore the {\it isotropic} physical properties in anisotropic quantum rings. In principle, all types of anisotropies (structural, effective masses, defects, etc.) can evolve as in isotropic rings, in our present approach. Most importantly, we have found a continuous evolution of the energy spectra and intraband optical characteristics of structurally anisotropic quantum rings to those of isotropic rings, in a controlled manner, with the help of a laser field.