Dresden 2017 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 63: Poster: Quantum Dots and Optics
HL 63.45: Poster
Wednesday, March 22, 2017, 15:00–19:00, P1A
Challenges of low density indium-flushed self-assembled quantum dots growth — •Rüdiger Schott, Julian Ritzmann, Sven Scholz, Sascha R. Valentin, Andreas D. Wieck, and Arne Ludwig — Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, Germany
Self-assembled InAs quantum dots (QDs) have been widely investigated due to their prospect applications in futuristic optoelectronic devices like single-photon sources.
For single optically addressable QDs, growth is usually performed with a rotation stop to obtain an indium flux gradient on the sample with reasonable low QD-density (108 cm−2) at a transition point. Starting from such a gradient sample, we report on our attempts to achieve homogeneous high quality MBE growth of low density indium-flushed QDs. We identify the main challenges to be related to substrate temperature inhomogeneity and slight indium flux variations. Detailed photoluminescence spectroscopy maps of the grown structures are presented and correlated with the profile of the heater and the indium cell geometry.