Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 59: Enabling Technologies: Quantum Dots and Superconductivity-based Systems

FM 59.1: Talk

Mittwoch, 25. September 2019, 14:00–14:15, 3043

Full Counting statistics of a driven single electron quantum dot — •Adrian Schmidt, Johannes C. Bayer, Timo Wagner, and Rolf J. Haug — Institut für Festkörperphysik, Leibniz Universität Hannover, Hanover, Germany

The AC driving of a single electron quantum dot shows as function of frequency and tunnelling rate clear signature of a quantum stochastic resonance. [1] We now analysed the tunnelling through such a single electron quantum dot in terms of full counting statistics.

For this we used a quantum dot formed by split gates in a GaAs/AlGaAs heterostructure with a nearby quantum point contact. The QPC allows to measure single electron tunnelling through the ac driven quantum dot in real time. From these data the full counting statistics for the driven tunnelling can be extracted. We analysed the collected data to identify the occurring transitions in the system and extracted the time dependend tunnelling rates for different modulations.

Reference
[1] T. Wagner, P. Talkner, J. C. Bayer, et. al., Nat. Phys. 15, 330-334 (2019).