Regensburg 2025 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 11: Superconductivity: Poster
TT 11.23: Poster
Monday, March 17, 2025, 15:00–18:00, P4
Stochastic resonance realized with a superconducting magnetic impurity state — •Philipp Maier1, Björn Kubala1,2, Joachim Ankerhold1, and Ciprian Padurariu1 — 1Institute for Complex Quantum Systems and IQST, Ulm University — 2German Aerospace Center (DLR), Ulm
The phenomenon of stochastic resonance was originally studied in the context of climatic changes and has since been observed in a variety of systems, both classical and quantum. Here, we employ this phenomenon to infer the rates of tunneling processes in the course of quantum electronic transport [1,2]. We theoretically investigate the emergence of stochastic resonance in superconducting junctions, focusing on a system where one electrode hosts a Yu-Shiba-Rusinov state -- a discrete bound state within the superconducting gap induced by the magnetic exchange interaction between a magnetic impurity and its superconducting host. Applying the framework of full counting statistics, we demonstrate that stochastic resonance manifests as the reduction of the Fano factor and a resonance of the tunneling current. The frequency of the resonance reveals information about the rate of microscopic electronic processes, e.g. the process responsible for quasiparticle-occupation parity breaking.
[1] M. Hänze et al., Sci. Adv. 7 (2021)
[2] T. Wagner et al., Nat. Phys. 15 (2019)
Keywords: Stochastic resonance; Magnetic atomic impurity; Yu-Shiba-Rusinov states; Superconducting junctions; Fano factor