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

AuthorsKleemans, N. A. J. M.; Blokland, J. H.; Taboada, Alfonso G.; van Genuchten, H. C. M.; Bozkurt, M.; Fomin, V. M.; Gladilin, V. N.; Granados, Daniel ; García Martínez, Jorge Manuel ; Christianen, P. C. M.; Maan, J. C.; Devreese, J. T.; Koenraad, P. M.
Quantum rings
Magnetic fields
Issue Date16-Oct-2009
PublisherAmerican Physical Society
CitationPhysical Review B 80, 155318 (2009)
AbstractWe 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.
Publisher version (URL)http://link.aps.org
Appears in Collections:(IMN-CNM) Artículos
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