Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 14: Focus Session: Site-selective Growth of single Quantum Dots
HL 14.1: Hauptvortrag
Montag, 26. März 2012, 15:00–15:30, ER 164
Growth and Device Integration of Site-Controlled Quantum Dots — •Sven Höfling1, Christian Schneider1, Alexander Huggenberger1, Vasilij Baumann1, Micha Strauß1, Thomas Sünner1, Tobias Heindel1, Lukas Worschech1, Stephan Reitzenstein1,2, Martin Kamp1, and Alfred Forchel1 — 1Technische Physik, Physikalisches Institut and Wilhelm Conrad Röntgen-Center for Complex Material Systems, Würzburg University, Am Hubland, Germany — 2Institut für Festkörperphysik, Technische Universität Berlin, Berlin, Germany
Single semiconductor quantum dots (QDs) are very attractive candidates to control charge and spin carries at the quantum level. One of the major challenges regarding the scalable fabrication of single QD based devices is however the precise control of the QD position within device structures. Within this work, we present a site-controlled growth technique using pre-patterned nanohole templates for the controlled integration of site-controlled quantum dots into nanoscale devices. By combining this growth technique with a process capable of accurately aligning QDs relatively to subsequently fabricated device structures, several interesting devices could be fabricated based on positioned QDs. For instance, cavity enhanced emission of single site-controlled QDs that were deterministically placed within photonic crystal or micropillar cavities has been demonstrated. Single photon emission of a coupled QD-resonator system has been proven by photon auto-correlation measurements, thus underlining the promise of the devices for quantum communication technologies.