Spin-Dependent Coupling of Charged Quantum Dot Excitons with Continuum States

B. Urbaszeka,b, R.J. Warburtona, K. Karraic, C. Schulhauserc, A. Högelec, E.J. McGheea, A.O. Govorovd, B.D. Gerardote, X. Marieb, T. Amandb and P.M. Petroffe aSchool of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK bLaboratoire de Nanophysique, Magnétisme et Optoélectronique, INSA, 135 av. de Rangueil, 31077 Toulouse Cedex 4, France cCenter for NanoScience and Sektion Physik, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 München, Germany dDepartment of Physics and Astronomy, Ohio University, Athens, Ohio USA eMaterials Department, University of California, Santa Barbara, California 93106, USA

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Received: 10 06 2004

Magnetic field and temperature dependent photoluminescence studies on neutral and charged excitons in individual InAs quantum dots allow us to uncover different mechanisms by which the discrete quantum dot states are coupled to delocalized continuum states in a quantum well (the wetting layer). The behaviour of the neutral and singly charged excitons can be explained taking only discrete quantum dot states into account. For doubly and triply charged excitons we have to consider spin dependent coherent and incoherent interactions between discrete quantum dot states and delocalized wetting layer states.

DOI: 10.12693/APhysPolA.106.395 PACS numbers: 73.21.La, 78.67.Hc