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HL: Fachverband Halbleiterphysik

HL 64: Poster II

HL 64.24: Poster

Donnerstag, 19. März 2020, 10:00–13:00, P1A

Examination of self-assembled quantum dots in a density-modulated pattern with capacitance-voltage spectroscopy — •Nikolai Spitzer, Nikolai Bart, Andreas Wieck, and Arne Ludwig — Ruhr-Universität Bochum, Lehrstuhl für Angewandte Festkörperphysik - Universitätsstraße 150, 44801 Bochum

Self-assembled InAs quantum dots (QDs) on GaAs with a QD density modulation were grown by molecular beam epitaxy. The QDs can be arranged in stripe patterns whose properties can be changed by a gradient in the GaAs sublayer beneath the QDs. We suspect that the formation of QDs is favoured by atomic rough areas as opposed to flat areas during molecular epitaxial growth. The differences in the sublayer are due to the profile of the molecular beam. Capacitance-voltage spectroscopy is used to investigate the properties of the quantum dots arranged in this way at different densities.