Impurity effects in the optical absorption of quantum rings

We study the interplay between impurity scattering and Coulomb interaction effects in the absorption spectrum of neutral bound magnetoexcitons confined in quantum-ring structures. Impurity scattering breaks the rotational symmetry of the ring system, introducing characteristic features in the optica...

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Bibliographic Details
Published in:	Physica. E, Low-dimensional systems & nanostructures Low-dimensional systems & nanostructures, 2006-05, Vol.32 (1), p.37-40
Main Authors:	Dias da Silva, Luis G.G.V., Ulloa, Sergio E., Shahbazyan, Tigran V.
Format:	Article
Language:	eng
Subjects:	Aharonov–Bohm effect Condensed matter: electronic structure, electrical, magnetic, and optical properties Exact sciences and technology Impurities Optical properties Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures Physics Quantum dots Quantum rings
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Summary:	We study the interplay between impurity scattering and Coulomb interaction effects in the absorption spectrum of neutral bound magnetoexcitons confined in quantum-ring structures. Impurity scattering breaks the rotational symmetry of the ring system, introducing characteristic features in the optical emission. Signatures of the optical Aharonov–Bohm effect are still present for weak scattering and strong Coulomb screening. Furthermore, an impurity-induced modulation of the absorption strength is present even for a strong impurity potential and low screening. This behavior is likely responsible of recent experimental observations in quantum-ring structures.
ISSN:	1386-9477 1873-1759