Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 57: Quantum Dots and Wires: Quantum Optics II
HL 57.2: Vortrag
Mittwoch, 9. März 2016, 12:30–12:45, H15
Optical Counting Statistics of Single Electron Tunneling into a Single Self-Assembled Quantum Dot — Annika Kurzmann1, Arne Ludwig2, Andreas D. Wieck2, Axel Lorke1, and •Martin Geller1 — 1Faculty of Physics and CENIDE, University of Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany — 2Chair of Applied Solid State Physics, Ruhr-Universität Bochum, Universitätsstr. 150, 44780 Bochum, Germany
We demonstrate here an optical detection scheme to observe single electron tunneling into a single self-assembled quantum dot (QD). The detection scheme is based on driving the excitonic transition into resonance fluorescence [1]. It allows us to use optical counting statistic [2] to reveal the interactions and correlations between excitons and electrons.
The single QD is embedded in a diode structure with a 3D charge reservoir, which allows the controlled charging and discharging of the QD. The time-resolved resonance fluorescence of the exciton is measured, while tunneling between the charge reservoir and the QD is possible. In the generated telegraph-noise we directly observe quantum jumps of the electrons tunneling into and out of the QD, which gives access to the distribution 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 in the current fluctuation.
[1] C. Matthiesen et al., Phys. Rev. Lett. 108, 093602 (2012).
[2] L. S. Levitov et al., J. Math. Phys. 37, 4845 (1996).