Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 11: Majorana Physics

TT 11.7: Vortrag

Montag, 1. April 2019, 16:45–17:00, H4

Quasiparticle poisoning in the RSJ model for Josephson Junctions — •Daniel Frombach1 and Patrik Recher1,21Institut für Mathematische Physik, TU Braunschweig — 2Laboratory for Emerging Nanometrology Braunschweig

The fractional 4 π Josephson effect, a specific feature of Majorana bound states, is based on a conserved fermion parity of the junction. Effects which break the fermion parity conservation, processes known as quasiparticle poisoning, however reduce the 4π periodic effect to the usual 2π periodicity. The timescale on which these effects occur has been estimated [1] and is generally system specific.

Here we analyze the quasiparticle poisoning by directly including it into a RSJ description of the fractional Josephson junction. We discuss possible measuring schemes for the poisoning rates as well as signatures of topology even in the presence of quasiparticle poisoning.
D. Rainis and D. Loss, Phys. Rev. B 85, 174533 (2012)

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