Dresden 2009 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 29: Quantum dots: Optical properties II
HL 29.9: Vortrag
Mittwoch, 25. März 2009, 12:00–12:15, BEY 154
Electric field tunable polarization and enhanced single-photon emission from lateral quantum dot molecules embedded in a planar microcavity — •Marcus Witzany1, Claus Hermannstädter1, Matthias Heldmaier1, Gareth J. Beirne1,4, Wolfgang-Michael Schulz1, Marcus Eichfelder1, Robert Rossbach1, Michael Jetter1, Lijuan Wang2, Armando Rastelli3, Oliver G. Schmidt3, and Peter Michler1 — 1Institut für Halbleiteroptik und Funktionelle Grenzflächen, Universität Stuttgart, Allmadring 3, 70569 Stuttgart — 2Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569 Stuttgart — 3Institut für Integrative Nanowissenschaften, IFW Dresden, Helmholtzstr. 20, 01069 Dresden — 4now: Cavendish Laboratories, University of Cambridge, J.J. Thomson Ave., Cambridge, CB3 0HE, UK
The photoluminescence (PL) from single InGaAs quantum dot molecules (QDMs) embedded in a planar micro-cavity grown using a combination of metal-organic vapor phase and molecular beam epitaxy has been examined. We demonstrate that embedding the QDM in a planar micro-cavity increases the single-photon extraction efficiency by a factor of 30. The molecules consist of two quantum dots coupled along the [1-10] crystal direction via electron tunneling [PRL 96, 137401, 2006]. The QDM PL is found to be linearly polarized along [1-10] with different polarization anisotropy values between 0 - 40% depending on the QDM geometry and coupling. Applying an electric field along the coupling axis can enhance the linear polarization of the PL due to electron wave function elongation.