Optical response of two-dimensional few-electron concentric double quantum rings: A local-spin-density-functional theory study

TL;DR

This study uses local-spin-density-functional theory to analyze how a perpendicular magnetic field influences the optical and electronic responses of few-electron two-dimensional concentric quantum rings, revealing localization effects and spectrum fragmentation.

Contribution

It provides a detailed theoretical analysis of magnetic field effects on electron localization and optical response in concentric quantum rings, highlighting new spectral features.

Findings

Magnetic field induces electron localization in inner and outer rings.

Localization leads to additional edge excitations.

Spectrum becomes more fragmented with increased magnetic field.

Abstract

We have investigated the dipole charge- and spin-density response of few-electron two-dimensional concentric nanorings as a function of the intensity of a perpendicularly applied magnetic field. We show that the dipole response displays signatures associated with the localization of electron states in the inner and outer ring favored by the perpendicularly applied magnetic field. Electron localization produces a more fragmented spectrum due to the appearance of additional edge excitations in the inner and outer ring.