Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 108: Topological Superconductors
TT 108.8: Vortrag
Freitag, 16. März 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 Belzig1 — 1Fachbereich 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.
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R. L. Klees et al., Phys. Rev. B 96, 144510 (2017).