Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 33: Transport: Majorana Fermions

TT 33.6: Vortrag

Dienstag, 21. März 2017, 15:15–15:30, HSZ 204

Non-equilibrium Andreev States Population in Short Conventional and Topological Superconducting Junctions — •Raffael Klees, Wolfgang Belzig, and Gianluca Rastelli — Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany

Recent experiments reported the observation of the non-equilibrium dynamics of the Andreev bound states (ABS) in superconducting atomic contacts (SAC) [1] and in proximized semiconductor nanowires [2]. Motivated by these reports, we study a short superconducting junction of length L ≪ ξ (coherence length) inserted in a dc-SQUID and coupled to an LC-resonator [2]. We calculate the non-equilibrium occupation of the ABS by taking into account the phase fluctuations in the dc-SQUID and by assuming that the junction is irradiated with photons. We analyse the role of the non-equilibrium distribution of the quasiparticles of the continuum in different regimes. We systematically compare the cases of a SAC and a topological junction [3] in order to point out the peculiar features of the latter. Finally, we discuss how to measure such a non-equilibrium occupation in experiments similar to [1].

[1] C. Janvier et al., Science 349, 1199 (2015); L. Bretheau et al., Nature 499, 312 (2013)

[2] A. P. Higginbotham et al., Nat. Phys. 11, 1017 (2015)

[3] J. I. Väyrynen et al., Phys. Rev. B 92, 134508 (2015)