Detecting perfect transmission in Josephson junctions on the surface of three dimensional topological insulators

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We consider Josephson junctions on surfaces of three dimensional topological insulator nanowires. We find that in the presence of a parallel magnetic field, short junctions on nanowires show signatures of a perfectly transmitted mode capable of supporting Majorana fermions. Such signatures appear in the current-phase relation in the presence or absence of the fermion parity anomaly, and are most striking when considering the critical current as a function of flux Phi, which exhibits a peak at Phi = h/2e. The peak sharpens in the presence of disorder at low but finite chemical potentials, and can be easily disentangled from weak-anti-localization effects. The peak also survives at small but finite temperatures, and represents a realistic and robust hallmark for perfect transmission and the emergence of Majorana physics inside the wire.
Publisher
IOP PUBLISHING LTD
Issue Date
2014-05
Language
English
Article Type
Article
Keywords

MAJORANA FERMIONS; SUPERCONDUCTORS; STATES; NANORIBBONS; NANOWIRES

Citation

NEW JOURNAL OF PHYSICS, v.16

ISSN
1367-2630
DOI
10.1088/1367-2630/16/5/053007
URI
http://hdl.handle.net/10203/189905
Appears in Collection
PH-Journal Papers(저널논문)
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