Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 36: Fluctuations, Noise and Quantum Coherence
TT 36.1: Vortrag
Mittwoch, 3. April 2019, 09:30–09:45, H7
Factorial cumulants of charge fluctuations: correlations vs. spin relaxation — •Philipp Stegmann1, Annika Kurzmann1,2, Jens Kerski1, Rüdiger Schott3, Arne Ludwig3, Andreas Wiek3, Axel Lorke1, Martin Geller1, and Jürgen König1 — 1Faculty of Physics and CENIDE, University of Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany — 2Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland — 3Chair for Applied Solid State Physics, Ruhr-Universität Bochum, Universitätsstr. 150, 44780 Bochum, Germany
We use factorial cumulants to study the charge fluctuations between a single self-assembled quantum dot and a charge reservoir [1]. Measurements are performed by means of a new optical technique allowing to resolve higher-order cumulants up to 25th order. The factorial cumulants, in contrast to ordinary ones, are most suited to reveal correlations between the tunneling events of electrons [2,3]. Moreover, they turn out to be less demanding on the time resolution of the charge detector. We are able to quantify accurately how spin-relaxation destroys correlations.
[1] A. Kurzmann, P. Stegmann, J. Kerski, R. Schott, A. Ludwig, A. D. Wieck, J. König, A. Lorke, and M. Geller, Optical detection of single electron transport dynamics, submitted.
[2] P. Stegmann and J. König, Phys. Rev. B 92, 155413 (2015).
[3] E. Kleinherbers, P. Stegmann, and J. König, New J. Phys. 20, 073023 (2018).