Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 74: Quantum dots: Optical properties
HL 74.9: Vortrag
Donnerstag, 14. März 2013, 11:45–12:00, H16
Cascaded emission of linearly polarized single photons from positioned InP/GaInP quantum dots — •Tristan Braun1, Vasilij Baumann1, Sebastian Unsleber1, Manuel Gschrey2, Sven Rodt2, Stephan Reitzenstein1,2, Sven Höfling1, Christian Schneider1, and Martin Kamp1 — 1Technische Physik, Physikalisches Institut and Wilhelm Conrad Röntgen-Research Center for Complex Material Systems, Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany — 2Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany
We report on the in-depth optical characterization of red-emitting site-controlled InP/GaInP Quantum Dots. In order to prove the long-range ordering of the buried emitters scanning cathodoluminescence with a high spatial resolution was performed, revealing a yield of ≈ 90% of optically active QDs on the pre-determined positions and the absence of emitters on interstitial positions. Polarization dependent investigations on the emission of single QDs show a pronounced degree of linear polarization along the (1-10) crystal axis with an average degree of polarization as large as 80%. Photon correlation measurements of the biexcitonic and excitonic emission of a single dot are employed to reveal the single-photon character of each emission line as well as the cascaded nature of the photon pair emission.