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Majorana splitting from critical currents in Josephson junctions
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
CSIC, ICMM, Cantoblanco, Madrid 28049, Spain..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
CSIC, ICMM, Cantoblanco, Madrid 28049, Spain..
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2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 96, no 20, article id 205425Article in journal (Refereed) Published
Abstract [en]

A semiconducting nanowire with strong Rashba spin-orbit coupling and coupled to a superconductor can be tuned by an external Zeeman field into a topological phase with Majorana zero modes. Here we theoretically investigate how this exotic topological superconductor phase manifests in Josephson junctions based on such proximitized nanowires. In particular, we focus on critical currents in the short junction limit (L-N << xi, where L-N is the junction length and xi is the superconducting coherence length) and show that they contain important information about nontrivial topology and Majoranas. This includes signatures of the gap inversion at the topological transition and a unique oscillatory pattern that originates from Majorana interference. Interestingly, this pattern can be modified by tuning the transmission across the junction, thus providing complementary evidence of Majoranas and their energy splittings beyond standard tunnel spectroscopy experiments, while offering further tunability by virtue of the Josephson effect.

Place, publisher, year, edition, pages
2017. Vol. 96, no 20, article id 205425
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-342376DOI: 10.1103/PhysRevB.96.205425ISI: 000415678400007OAI: oai:DiVA.org:uu-342376DiVA, id: diva2:1184873
Funder
Swedish Research CouncilGöran Gustafsson Foundation for promotion of scientific research at Uppala University and Royal Institute of TechnologySwedish Foundation for Strategic Research Knut and Alice Wallenberg FoundationAvailable from: 2018-02-22 Created: 2018-02-22 Last updated: 2018-02-22Bibliographically approved

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Cayao, JorgeBlack-Schaffer, Annica M.

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