Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 6: Superconductivity: Tunnelling & Josephson Junctions

TT 6.11: Talk

Monday, March 11, 2013, 12:15–12:30, H18

Spin-precession-assisted tunneling in hybrid superconducting point contacts — •Cecilia Holmqvist¹, Wolfgang Belzig¹, and Mikael Fogelström² — ¹Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany — ²Department of Microtechnology and Nanoscience - MC2, Chalmers University of Technology, SE-412 96 Göteborg, Sweden

The charge and spin transport properties of a quantum point contact coupled to a nanomagnet depend strongly on the dynamics of the nanomagnet's spin. We analyze the current-voltage characteristics of a junction coupled to a spin whose dynamics is modeled as Larmor precession brought about by an external magnetic field. The interaction between the spin dynamics and the Josephson effect leads to a rich subgap structure due to spin-precession-assisted multiple Andreev reflections. Additionally, the spin current displays Shapiro-like resonances due to the interplay between the ac Josephson current and the Larmor precession.