Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 66: Superconductivity: Yu-Shiba-Rusinov and Andreev Physics
TT 66.6: Vortrag
Donnerstag, 21. März 2024, 10:45–11:00, H 3005
Full counting statistics of Yu-Shiba-Rusinov bound states — •David Christian Ohnmacht1, Wolfgang Belzig1, and Juan Carlos Cuevas2 — 1Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany — 2Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, E-28049 Madrid, Spain
We adapt the concept of full counting statistics (FCS) to provide the deepest insight thus far into the spin-dependent transport in systems containing Yu-Shiba-Rusinov (YSR) states [1]. Such systems include single-impurity junctions with a normal and a superconducting (SC) STM tip, as well as double-impurity systems [2]. The FCS concept allows us to identify every tunneling process that plays a role in these situations and to classify them according to the charge transferred in them. In particular, our approach is able to reproduce the experimental results recently reported on the shot noise of a single-impurity junction with a normal STM tip [3]. We also predict the signatures of resonant multiple Andreev reflections in the shot noise of single-impurity junctions with two SC electrodes and show that the FCS approach allows us to understand conductance features that have been incorrectly interpreted in the literature. In the case of double-impurity junctions we show that the direct tunneling between YSR states is characterized by a strong reduction of the Fano factor that reaches a minimum value of 7/32.
[1] D. C. Ohnmacht et. al., Phys. Rev. Res. 5 (2023) 033176
[2] H. Huang et. al., Nat. Phys. 16 (2020) 1227
[3] U. Thupakula et. al., Phys. Rev. Lett. 128 (2022) 247001
Keywords: Superconductivity; Yu-Shiba-Rusinov states; Andreev reflection; Spintronics; Full counting statistics