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Electronic quantum dot states induced through photon emission

AuthorsSchulhauser, C.; Högele, A.; Warburton, Richard J.; Govorov, Alexander O.; Karrai, Khaled; García Martínez, Jorge Manuel CSIC ORCID CVN ; Gerardot, B. D.; Petroff, Pierre M.
Issue DateJul-2004
CitationPhysica Status Solidi C 1(8): 2079-2093 (2004)
AbstractWe review the optics of negatively charged excitons in self assembled InAs/GaAs quantum dots. The charging state of a quantum dot was tuned electrostatically in a field effect structure. We investigated in this way the neutral exciton as well as the negatively singly, doubly and triply charged excitons, namely the X0, X1–, X2– and X3– excitons. A Zeeman splitting and a diamagnetic shift in the photoluminescence emission line is clearly observed for X0, X1– and X2– exciton as a function of magnetic field. In contrast the triply negatively charged exciton shows a completely different magnetic behaviour. Here, under the influence of a high magnetic field, the quantum dot electronic states are found to be hybridized with the continuum of states in the wetting layer. Such a hybridization turns out to be induced by photon emission of the X3– exciton.
Description15 páginas, 9 figuras, 1 tabla.-- PACS 71.35.–y, 73.40.Rw, 78.66.Fd, 78.67.Hc
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