Regensburg 2022 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity: Poster Session

TT 30.22: Poster

Thursday, September 8, 2022, 15:00–18:00, P1

Coupling of supercurrent and quasiparticle excitations in superconductor nanostructures — •Paul Maier and Detlef Beckmann — Institut für Quantenmaterialien und Technologien, Karlsruher Institut für Technologie

We report on the experimental observation of coupling between nonequilibrium modes of the quasiparticle excitations in thin superconducting films in the presence of supercurrent and high parallel magnetic fields. The coupling is due to a difference in the number of available quasiparticle states, depending on their relative propagation direction to the supercurrent. Recently the occurrence of a spin-energy (spin-antisymmetric charge imbalance) current in the presence of energy imbalance was predicted [1]. Here the resulting spin-energy imbalance for a spatial gradient in the energy imbalance was probed in nonlocal conductance measurements with spectral resolution. The measurements show excellent agreement with numerical models and provide proof of the coupling of energy and spin-energy modes.

[1] F.Aikebaier et al., Phys. Rev. B 98, 024516 (2018)