SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 60: Quantum Dots, Quantum Wires, Point Contacts

TT 60.2: Vortrag

Donnerstag, 30. März 2023, 17:30–17:45, HSZ 03

Stochastic resonance of electron tunneling in a quantum dot in spite of a periodically blind eye — •Eric Kleinherbers, Hendrik Mannel, Johann Zöllner, Marcel Zöllner, Martin Geller, Axel Lorke, and Jürgen König — Faculty of Physics and CENIDE, University Duisburg-Essen, 47057 Duisburg, Germany

The key idea of stochastic resonance is to amplify a signal by adding noise. For electron tunneling in a quantum dot, this can be used to facilitate a periodic electron transfer, where during each period a single electron enters and leaves the quantum dot. In stochastic resonance, the noise (tunneling) rate must be well adjusted to the frequency of the periodic drive that is applied to the quantum dot. The Fano factor is a possible indicator of this effect [1]. Here, we study the full counting statistics and, in particular, factorial cumulants as higher-order indicators of stochastic resonance. We discuss experimental data of electron tunneling into and out of a self-assembled InAs quantum dot, where the full counting statistics is measured using a resonance fluorescence readout scheme. We find that even if the detector is blind during half of each period, a stochastic resonance is visible in the full counting statistics.
[1] T. Wagner et al., Nat. Phys. 15, 330 (2019)