Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 85: Superconductivity: Yu-Shiba-Rusinov and Andreev Physics
TT 85.4: Vortrag
Donnerstag, 12. März 2026, 15:45–16:00, CHE/0089
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 (SR) was originally studied in the context of climatic changes and has since been observed in a variety of classical and quantum systems. Here, we theoretically investigate the emergence of SR in superconducting junctions to infer the rates of quantum electronic tunneling processes [1,2].
We focus on a system where one electrode hosts a Yu-Shiba-Rusinov (YSR) 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 (FCS), we demonstrate that SR manifests as a reduction of the Fano factor and a resonance of the tunneling current. Crucially, the frequency of this resonance reveals information about the rate of microscopic electronic processes, such as 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