Charged magneto-exciton states in semiconductor quantum dots |
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| Authors: | R.J. Warburton, B. Urbaszek, E.J. McGhee, C. Schulhauser, A. H gele, K. Karrai, B.D. Gerardot,P.M. Petroff |
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| Affiliation: | aDepartment of Physics, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK;bLaboratoire de Physique de la Matière Condensée, LNMO-INSA-CNRS, 135 Avenue de Rangueil, 31077 Toulouse Cedex 4, France;cCenter for NanoScience, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 Munich, Germany;dMaterials Department, University of California Santa Barbara, CA 93106, USA |
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| Abstract: | By embedding a layer of self-assembled quantum dots into a field-effect structure, we are able to control the exciton charge in a single dot. We present the results of photoluminescence experiments as a function of both charge and magnetic field. The results demonstrate a hierarchy of energy scales determined by quantization, the direct Coulomb interaction, the electron–electron exchange interaction, and the electron–hole exchange interaction. For excitons up to the triply charged exciton, the behavior can be understood from a model assuming discrete levels within the quantum dot. For the triply charged exciton, this is no longer the case. In a magnetic field, we discover a coherent interaction with the continuum states, the Landau levels associated with the wetting layer. |
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| Keywords: | Quantum dots Excitons Landau level |
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