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American Physical Society, Physical review B, 15(80)

DOI: 10.1103/physrevb.80.155318

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

Journal article published in 2009 by Najm Niek Kleemans, Najm A. J. M. Kleemans, Jh H. Blokland, Ag G. Taboada, Hcm Eric van Genuchten, H. C. M. van Genuchten, H. C. M. Van Genuchten, van H C. M. Genuchten, M. Murat Bozkurt, V. M. Fomin, Vn N. Gladilin, Vm Vladimir Fomin, D. Granados ORCID, Pcm Peter Christianen, P. C. M. Christianen and other authors.
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This paper is available in a repository.

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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.