Polarization and Aharonov-Bohm oscillations in quantum-ring magnetoexcitons

TL;DR

This paper investigates how interaction, polarization, and impurities influence the Aharonov-Bohm oscillations in the absorption spectra of magnetoexcitons confined in quantum rings, revealing key factors affecting their optical properties.

Contribution

It demonstrates the impact of dipole moment orientation, interaction screening, and impurities on Aharonov-Bohm oscillations in quantum-ring magnetoexcitons, providing insights for experimental studies.

Findings

Aharonov-Bohm oscillations vary with exciton dipole orientation and interaction strength.

Impurity scattering causes anticrossings and modulates absorption strength.

Radial polarization enhances the visibility of oscillations in absorption spectra.

Abstract

We study interaction and radial polarization effects on the the absorption spectrum of neutral bound magnetoexcitons confined in quantum-ring structures. We show that the size and orientation of the exciton's dipole moment, as well as the interaction screening, play important roles in the Aharonov-Bohm oscillations. In particular, the excitonic absorption peaks display A-B oscillations both in position and amplitude for weak electron-hole interaction and large radial polarization. The presence of impurity scattering induces anticrossings in the exciton spectrum, leading to a modulation in the absorption strength. These properties could be used in experimental investigations of the effect in semiconductor quantum-ring structures.