Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 91: Poster Session: Quantum dots and wires: preparation & characterization & optical properties & transport properties

HL 91.1: Poster

Donnerstag, 14. März 2013, 16:00–20:00, Poster A

Fabrication and characterization of site-controlled quantum dots grown on pre-patterned GaAs substrates — •Patrick Krawiec, Muhammad Usman, Mohamed Benyoucef, and Johann Peter Reithmaier — Nanostructure Technologies and Analytics, CINSaT, University of Kassel, Heinrich-Plett-Strasse 40, 34132 Kassel, Germany

Semiconductor quantum dots (QDs) are attractive building blocks for scalable quantum information processing systems. In the last years, there has been an increasing need for the investigation of site-controlled QDs, which can be used as active elements in quantum devices such as single-photon sources. In this work, we present the growth of site-controlled InAs QDs on pre-patterned GaAs substrates using electron beam lithography, wet-chemical etching and molecular beam epitaxy. Large QD arrays with periodicities ranging from 0.5 µm to 8 µm were achieved. The single QDs obtained in this study present a high optical quality, which have been evaluated by micro-photoluminescence.