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Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 108: Topological Superconductors

TT 108.8: Talk

Friday, March 16, 2018, 11:30–11:45, H 2053

Nonequilibrium Andreev bound states population in short superconducting junctions coupled to a resonator — •Raffael L. Klees1, Gianluca Rastelli1,2, and Wolfgang Belzig11Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany — 2Zukunftskolleg, Universität Konstanz, D-78457 Konstanz, Germany

Inspired by recent experiments [1], we study a short superconducting junction of length L ≪ ξ (coherence length) inserted in a dc-SQUID containing an ancillary Josephson tunnel junction. We evaluate the nonequilibrium occupation of the Andreev bound states (ABS) for the case of a conventional junction and a topological junction [2], with the latter case of ABS corresponding to a Majorana mode. We take into account small phase fluctuations of the Josephson tunnel junction, acting as a damped LC resonator, and analyze the role of the distribution of the quasiparticles of the continuum assuming that these quasiparticles are in thermal distribution with an effective temperature different from the environmental temperature. We also discuss the effect of strong photon irradiation in the junction leading to a nonequilibrium occupation of the ABS. We systematically compare the occupations of the bound states and the supercurrents carried by these states for conventional and topological junctions.
L. Bretheau et al., Nature 499, 312 (2013);
C. Janvier et al., Science 349, 1199 (2015);
D. J. van Woerkom et al., Nat. Phys. 13, 876 (2017);
A. Murani et al., Nat. Commun. 8, 15941 (2017).
R. L. Klees et al., Phys. Rev. B 96, 144510 (2017).

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