Excitonic behavior in self-assembled InAs/GaAs quantum rings in high magnetic fields

N.A.J.M. Kleemans, J.H. Blokland, A.G. Taboada, H.C.M. Genuchten, van, M. Bozkurt, V.M. Fomin, V.N. Gladilin, D. Granados, J.M. Garcia, P.C.M. Christianen, J.C. Maan, J.T. Devreese, P.M. Koenraad

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Abstract

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.
Original languageEnglish
Article number155318
Pages (from-to)155318-1/4
JournalPhysical Review B
Volume80
Issue number15
DOIs
Publication statusPublished - 2009

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