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Josephson effect in a Weyl SNS junction
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Rekke forfattare: 32017 (engelsk)Inngår i: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 95, nr 6, artikkel-id 064511Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We calculate the Josephson current density j (phi) for a Weyl superconductor-normal-metal-superconductor junction for which the outer terminals are superconducting Weylmetals and the normal layer is a Weyl (semi) metal. We describe the Weyl (semi) metal using a simple model with two Weyl points. The model has broken time-reversal symmetry, but inversion symmetry is present. We calculate the Josephson current for both zero and finite temperature for the two pairing mechanisms inside the superconductors that have been proposed in the literature, zero-momentum BCS-like pairing and finite-momentum FFLO-like pairing, and assuming the short-junction limit. For both pairing types we find that the current is proportional to the normal-state junction conductivity, with a proportionality coefficient that shows quantitative differences between the two pairing mechanisms. The current for the BCS-like pairing is found to be independent of the chemical potential, whereas the current for the FFLO-like pairing is not.

sted, utgiver, år, opplag, sider
2017. Vol. 95, nr 6, artikkel-id 064511
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URN: urn:nbn:se:su:diva-141410DOI: 10.1103/PhysRevB.95.064511ISI: 000394368600007OAI: oai:DiVA.org:su-141410DiVA, id: diva2:1089177
Tilgjengelig fra: 2017-04-18 Laget: 2017-04-18 Sist oppdatert: 2017-11-29bibliografisk kontrollert

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