Impurity effects in the optical absorption of quantum rings |
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Authors: | Luis GGV Dias da Silva Sergio E Ulloa Tigran V Shahbazyan |
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Institution: | aDepartment of Physics and Astronomy, Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, OH 45701-2979, USA;bDepartment of Physics and Computational Center for Molecular Structure and Interactions, Jackson State University, Jackson, MS 39217, USA |
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Abstract: | 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. |
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Keywords: | Quantum rings Aharonov– Bohm effect Impurities Optical properties Quantum dots |
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