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Josephson effect in graphene bilayers with adjustable relative displacement

Mohammad Alidoust, Antti-Pekka Jauho, and Jaakko Akola
Phys. Rev. Research 2, 032074(R) – Published 30 September 2020
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Abstract

The Josephson current is investigated in a superconducting graphene bilayer where pristine graphene sheets can make in-plane or out-of-plane displacements with respect to each other. The superconductivity can be of an intrinsic nature, or due to a proximity effect. The results demonstrate that the supercurrent responds qualitatively differently to relative displacement if the superconductivity is due to either intralayer or interlayer spin-singlet electron-electron pairing, thus providing a tool to distinguish between the two mechanisms. Specifically, both the AA and AB stacking orders are studied with antiferromagnetic spin alignment. For the AA stacking order with intralayer and on-site pairing no current reversal is found. In contrast, the supercurrent may switch its direction as a function of the in-plane displacement and out-of-plane interlayer coupling for the cases of AA ordering with interlayer pairing and AB ordering with either intralayer or interlayer pairing. In addition to sign reversal, the Josephson signal displays many characteristic fingerprints which derive directly from the pairing mechanism. Thus, measurements of the Josephson current as a function of the graphene bilayer displacement open up the means to achieve deeper insights into the superconducting pairing mechanism.

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  • Received 8 May 2020
  • Revised 6 August 2020
  • Accepted 16 September 2020

DOI:https://doi.org/10.1103/PhysRevResearch.2.032074

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Mohammad Alidoust1, Antti-Pekka Jauho2, and Jaakko Akola1,3

  • 1Department of Physics, NTNU Norwegian University of Science and Technology, NO-7491 Trondheim, Norway
  • 2Center for Nanostructured Graphene (CNG), DTU Physics, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
  • 3Computational Physics Laboratory, Tampere University, P.O. Box 692, FI-33014 Tampere, Finland

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Vol. 2, Iss. 3 — September - November 2020

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