Polarization and Aharonov-Bohm oscillations in quantum-ring magnetoexcitons

Details Polarization and Aharonov-Bohm oscillations in quantum-ring magnetoexcitons Polarization and Aharonov-Bohm oscillations in quantum-ring magnetoexcitons

2005-04-21

arxiv.org/abs/cond-mat/0504569v2

Phys. Rev. B 72 125327 (2005).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Updated version, 6 pages, 4 figures. To appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.72.125327

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.

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