Regensburg 2019 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 35: HL Poster II
HL 35.43: Poster
Mittwoch, 3. April 2019, 17:30–20:00, Poster E
The influence of the tunnel coupling to a charge reservoir on the Auger process in self-assembled quantum dots — •Pia Lochner1, Annika Kurzmann1, Jens Kerski1, Rüdiger Schott2, Andreas Dirk Wieck2, Arne Ludwig2, Axel Lorke1, and Martin Geller1 — 1Faculty of Physics and CENIDE, University of Duisburg-Essen, Germany — 2Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, Germany
Auger recombination is a non-radiative process, where the recombination energy of an electron hole pair is transferred to a third charge carrier. In colloidal quantum dots (QDs), this is a common effect which quenches the radiative emission with recombination times in the order of picoseconds [1]. In self-assembled QDs, it was speculated to be absent, and only recently, it has become possible to observe Auger recombination in these structures [2].
In this contribution, we investigate Auger recombination on a single self-assembled QD coupled to a charge reservoir with a small tunneling rate in the order of ms-1. We observe in time-resolved resonance fluorescence measurements how the small tunneling rate of the sample structure influences the Auger rate and the quenching of the trion fluorescence intensity. Furthermore, we perform real-time measurements of the random telegraph signal which gives access to the statistics of the Auger process.
[1] R. Vaxenburg, et al., Nano Lett. 15, 2092 (2015).
[2] A. Kurzmann, et al., Nano Lett. 16, 3367 (2016).