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HL: Halbleiterphysik
HL 52: Quantum dots and wires: Optical properties IV
HL 52.8: Vortrag
Freitag, 31. März 2006, 12:45–13:00, POT 151
Quantum light emission of two lateral tunnel-coupled InGaAs/GaAs quantum dots controlled by a tunable static electric field — •Claus Hermannstädter1, Gareth J. Beirne1, Lijuan Wang2, Armando Rastelli2, Oliver G. Schmidt2, and Peter Michler1 — 15. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany — 2Max-Planck Institut für Festkörperforschung, Heisenbergstr. 1, 70569 Stuttgart, Germany
We present the observation of lateral quantum coupling between two self-assembled InGaAs/GaAs quantum dots (QDs). Each single lateral quantum dot molecule (QDM) exhibits a distinctive photoluminescence spectrum consisting of neutral and charged excitonic, as well as biexcitonic emission. Photon statistics measurements between the dominant emission lines display strong antibunching, confirming the presence of quantum coupling within the QDM, and cascaded emission between corresponding biexcitonic and excitonic emission. We also show that the coupling can be controlled using a static electric field, and that the relative intensities of the two neutral excitonic transitions can be reversibly switched between the two emission energies. Subsequently, the QDM can be used as a tunable single-photon emitter simply by applying a small electric field.