Polarization and Aharonov-Bohm oscillations in quantum-ring magnetoexcitons

Journal Article · Thu Sep 15 04:00:00 EDT 2005 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.72.125327· OSTI ID:20719544

Ulloa, Sergio E ^[1]; Shahbazyan, Tigran V ^[2]

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1. Department of Physics and Astronomy, Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, Ohio 45701-2979 (United States)
2. Department of Physics and Computational Center for Molecular Structure and Interactions, Jackson State University, Jackson, Mississippi 39217 (United States)

We study interaction and radial polarization effects on 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 (AB) oscillations. In particular, the excitonic absorption peaks display AB 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.

• OSTI ID: 20719544
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 12 Vol. 72; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTRA
AHARONOV-BOHM EFFECT
AMPLITUDES
DIPOLE MOMENTS
EXCITED STATES
EXCITONS
HOLES
IMPURITIES
ORIENTATION
OSCILLATIONS
POLARIZATION
QUANTUM DOTS
SCATTERING
SEMICONDUCTOR MATERIALS