Regensburg 2025 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 47: Fluctuations, Noise and Other Transport Topics (joint session TT/DY)
TT 47.5: Talk
Thursday, March 20, 2025, 16:00–16:15, H31
Quantum stochastic resonance in a periodically-driven quantum dot — •Johann Zöllner1, Hendrik Mannel1, Eric Kleinherbers2, Marcel Zöllner1, Nico Schwarz1, Fabio Rimek1, Andreas Wieck3, Arne Ludwig3, Axel Lorke1, Martin Geller1, and Jürgen König1 — 1Faculty of Physics and CENIDE, University of Duisburg-Essen — 2Department of Physics and Astronomy, University of California, Los Angeles — 3Faculty of Physics and Astronomy, Ruhr University Bochum
The combination of periodic driving and fluctuations in a system with an inherent noise source leads to stochastic resonance, where the synchronization of the system dynamics with the external drive leads to an enhanced signal-to-noise ratio. This phenomenon has been found in many different noisy systems in palaeoclimatology, biology, medicine and physics. The classical stochastic resonance with thermal noise has recently been experimentally extended to the quantum regime, where the fundamental randomness of individual quantum events is the noise source [1]. Here we demonstrate quantum stochastic resonance in the single-electron tunneling dynamics of a periodically driven single self-assembled quantum dot, tunnel-coupled to an electron reservoir [2]. We extend the statistical evaluation to factorial cumulants to gain a deeper understanding of the transition between stochastic and deterministic transport through the quantum dot.
[1] T. Wagner et al., Nat. Phys. 15, 330 (2019).
[2] A. Kurzmann et. al., Phys. Rev. Lett. 122, 247403 (2019).
Keywords: stochastic resonance; quantum dot; full counting statistics; factorial cumulants