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HL: Fachverband Halbleiterphysik

HL 75: Quantum Dots: Transport Properties II

HL 75.1: Hauptvortrag

Donnerstag, 23. März 2017, 14:45–15:15, POT 151

Spectroscopy on self-assembled quantum dots: Transport meets optics — •Martin Geller — Faculty of Physics and CENIDE, University of Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany

Self-assembled quantum dots (QDs) are nanoscopic semiconductor islands in a crystalline matrix material. After more than 20 years, these "artificial atoms" are still of great interest to study fundamental physics in low-dimensional systems. They have entered commercially available products and have visionary future perspectives in quantum information processing.

After a general introduction, I will summarize the transport (like capacitance-voltage spectroscopy) and optical methods (like micro-photoluminescence) on self-assembled QDs. Afterwards, I will introduce the time-resolved conductance spectroscopy [1] and show a combination of "transport and optics". In an optical detection scheme, based on resonance fluorescence, the electron tunneling (and quantum jumps), photo-induced electron capture and Auger-recombination can be observed time-resolved on a single self-assembled dot [2].

[1] B. Marquardt, et al., Nature Commun. 2, 209 (2011); A. Beckel, et al., Phys. Rev. B 89, 155430 (2014). [2] A. Kurzmann, et al., Phys. Rev. Lett. 117, 017401 (2016); A. Kurzmann, et al., Appl. Phys. Lett. 108, 263108 (2016); A. Kurzmann, et al., Nano Lett. 16, 3367 (2016).