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Absorption and photoluminescence spectroscopy on a single self-assembled charge-tunable quantum dot

AuthorsSeidl, Stefan; Kroner, M.; Dalgarno, P. A.; Högele, A.; Smith, J. M.; Ediger, M.; Gerardot, B. D.; García Martínez, Jorge Manuel ; Petroff, Pierre M.; Karrai, Khaled; Warburton, Richard J.
Quantum dot
Issue Date28-Nov-2005
PublisherAmerican Physical Society
CitationPhysical Review B 72: 195339 (2005)
AbstractWe have performed detailed photoluminescence (PL) and absorption spectroscopy on the same single self-assembled quantum dot in a charge-tunable device. The transition from neutral to charged exciton in the PL occurs at a more negative voltage than the corresponding transition in absorption. We have developed a model of the Coulomb blockade to account for this observation. At large negative bias, the absorption broadens as a result of electron and hole tunneling. We observe resonant features in this regime whenever the quantum dot hole level is resonant with two-dimensional hole states located at the capping layer-blocking barrier interface in our structure.
Publisher version (URL)http://link.aps.org/doi/10.1103/PhysRevB.72.195339
Appears in Collections:(IMN-CNM) Artículos
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