A novel magnetic interference effect is proposed for a neutral, but polarizable exciton in a quantum ring with a finite width. The magnetic interference effect originates from the nonzero dipole moment in the exciton. The ground state of exciton acquires a nonzero angular momentum with increasing normal magnetic field. This leads to the suppression of the photoluminescence in defined windows of the magnetic field.
@article{arxiv.cond-mat/0111006,
title = {Magnetoexcitons in quantum-ring structures: a novel magnetic interference effect},
author = {S. E. Ulloa and A. O. Govorov and A. V. Kalameitsev and R. Warburton and K. Karrai},
journal= {arXiv preprint arXiv:cond-mat/0111006},
year = {2009}
}