Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 69: Quantum Dots: Transport Properties I
HL 69.7: Vortrag
Donnerstag, 23. März 2017, 11:30–11:45, POT 151
Time-resolved optical detection of electron tunneling into a single self-assembled quantum dot — •Annika Kurzmann1, Jens Kerski1, Arne Ludwig2, Andreas D. Wieck2, Axel Lorke1, and Martin Geller1 — 1Faculty of Physics and CENIDE, University of Duisburg-Essen, Germany. — 2Chair of Applied Solid State Physics, Ruhr-University Bochum, Germany.
Self-assembled quantum dots (QDs) as artificial atoms are promising building blocks for QD lasers and single photon sources and have been intensively investigated in optical and transport measurements. While transport measurements are still limited to measurements of ensembles of self-assembled QDs, optical measurements give access to single QDs [1].
We demonstrate here an optical detection scheme to observe quantum jumps for single electron tunneling into a single self-assembled QD. The detection scheme is based on driving the excitonic transition into resonance fluorescence [2], which is quenched in the presence of an additional electron. The observed random telegraph signal of single electron tunneling is evaluated using counting statistics. This reveals the interactions and correlations between excitons and electrons and gives direct access to the statistics of the fluctuations, i.e. shot noise and Fano factor. A reduced Fano factor is observed for equal tunneling rates into and out of the QD, due to an enhanced correlation between the electron tunneling events.
[1] A. Kurzmann et al., Phys. Rev. Lett. 117, 017401 (2016).
[2] C. Matthiesen et al., Nat. Commun. 4, 1600 (2013).