Polarization and Aharonov-Bohm oscillations in quantum-ring magnetoexcitons

Luis G. Dias da Silva, Sergio E. Ulloa, Tigran V. Shahbazyan

Published 2005-04-21, updated 2005-08-03Version 2

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.