Aharonov-Bohm Effect in Concentric Quantum Double Rings

TL;DR

This paper presents a theoretical study of the Aharonov-Bohm effect in concentric quantum double rings, analyzing how potential strength and impurities influence electron spectra and AB oscillations.

Contribution

It introduces a model for single-electron spectra in concentric quantum rings and explores the effects of potential screening and impurities on AB oscillations.

Findings

AB oscillations depend on screened potential strength

Impurities affect energy spectra and AB oscillations

Exact diagonalization effectively models electron behavior

Abstract

We propose a theoretical model to study the single-electron spectra of the concentric quantum double ring fabricated lately by self-assembled technique. Exact diagonalization method is employed to examine the Aharonov-Bohm effect in the concentric double ring. It is found the appearance of the AB oscillation in total energy depends on the strength of the screened potential. Variations of the energy spectra with the presence of coulomb impurities located at inner or outer ring are also investigated.