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HL: Fachverband Halbleiterphysik

HL 17: Quantum Dots and Wires: Rings, Wires and Transport

HL 17.3: Vortrag

Dienstag, 10. März 2026, 10:00–10:15, POT/0251

Using full counting statistics to identify interactions in the electron dynamics in a self assembled quantum dot — •Johann Zöllner, Hendrik Mannel, Daniel Oppers, Axel Lorke, Martin Geller, and Jürgen König — Faculty of Physics and CENIDE, University of Duisburg-Essen

We study interactions and electron dynamics in a self-assembled quantum dot using full counting statistics. Each tunneling event identified with a resonance-fluorescence-based continuous measurement [1]. Full counting statistics provides much more information than just the average current through the system. The details of the probability distribution obtained from full counting statistics depends on whether interactions play a role in electron transport or whether it can be modeled by noninteracting fermions [2,3]. This is reflected in sign changes of the factorial cumulants calculated from the probability distribution. Factorial cumulants are a measure for fluctuations and are particularly suited to characterize discrete distributions. We identify these sign changes predicted by theory in the experimental data. In this way, simply by observing individual tunneling events between the dot and a reservoir, we have gained information about the electron dynamiks like spin relaxation between Zeeman-split energy level and the presence of interactions.

[1] A. Kurzmann et al., PRL 122, 247403 (2019)

[2] D. Kambly et al., PRB 83, 075432 (2011)

[3] P. Stegmann et al., PRB 92, 155413 (2015)

Keywords: full counting statistics; quantum dot; correlated electron transport; factorial cumulants; resonance fluorescence spectroscopy