Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 33: Transport: Majorana Fermions

TT 33.1: Vortrag

Dienstag, 21. März 2017, 14:00–14:15, HSZ 204

Subband-mixing signatures in Andreev-reflection-enhanced conductance of a quantum point contact — Michal Nowak and •Michael Wimmer — QuTech and Kavli institute of nanoscience, TU Delft, Netherlands

Andreev reflection leads enhancement of the conductance in a quantum point contact, doubling the conductance plateaus [1]. Recent experiments [2, 3] found evidence for this Andreev enhancement, but showed additional, pronounced conductance dips before the transition to the next plateau, at odds with the conductance doubling of [1].

Here, we show that scattering between subbands due to weak disorder can fully explain these observations. This allows to give an estimate for the mean free path in Majorana devices [3].

[1] C.W.J. Beenakker. Phys. Rev. B 46, 12841 (1997)

[2] M. Kjaergaard et al., Nat. Commun. 7, 12841 (2016)

[3] H. Zhang et al., arXiv:1603.01852