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Title
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Excitonic behavior in self-assembled InAs/GaAs quantum rings in high magnetic fields
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Author
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Abstract
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| We investigate the exciton energy level structure of a large ensemble of InAs/GaAs quantum rings by photoluminescence spectroscopy in magnetic fields up to 30 T for different excitation densities. The confinement of an electron and a hole in these type I quantum rings along with the Coulomb interaction suppress the excitonic Aharonov-Bohm effect. We show that the exciton energy levels are nonequidistant and split up in only two levels in magnetic field, reflecting the ringlike geometry. A model, based on realistic parameters of the self-assembled quantum rings, allows us to interpret the essential features of the observed PL spectra in terms of the calculated optical transition probabilities. |
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Language
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English
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Source (journal)
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Physical review : B : solid state. - Lancaster, Pa, 1970 - 1978
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Publication
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Lancaster, Pa
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2009
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ISSN
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0556-2805
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DOI
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10.1103/PHYSREVB.80.155318
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Volume/pages
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80
:15
(2009)
, p. 155318,1-155318,4
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ISI
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000271352000093
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Full text (Publisher's DOI)
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Full text (open access)
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