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• W2022226732 abstract "We investigate the Josephson current in a graphene superconductor/normal/superconductor junction, where superconductivity is induced by means of the proximity effect from external contacts. We take into account the possibility of anisotropic pairing by also including singlet nearest-neighbor interactions, and investigate how the transport properties are affected by the symmetry of the superconducting order parameter. This corresponds to an extension of the usual on-site interaction assumption, which yields an isotropic $s$-wave order parameter near the Dirac points. Here, we employ a full numerical solution as well as an analytical treatment, and show how the proximity effect may induce exotic types of superconducting states near the Dirac points, e.g., ${p}_{x}$- and ${p}_{y}$-wave pairing or a combination of $s$- and $p+text{i}p$-wave pairing. We find that the Josephson current exhibits a weakly damped, oscillatory dependence on the length of the junction when the graphene sheet is strongly doped. The analytical and numerical treatments are found to agree well with each other in the $s$-wave case when calculating the critical current and current-phase relationship. For the scenarios with anisotropic superconducting pairing, there is a deviation between the two treatments, especially for the effective ${p}_{x}$-wave order parameter near the Dirac cones which features zero-energy states at the interfaces. This indicates that a numerical, self-consistent approach becomes necessary when treating anisotropic superconducting pairing in graphene." @default.
• W2022226732 created "2016-06-24" @default.
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• W2022226732 date "2009-09-24" @default.
• W2022226732 modified "2023-10-01" @default.
• W2022226732 title "Josephson current in graphene: Role of unconventional pairing symmetries" @default.
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• W2022226732 doi "https://doi.org/10.1103/physrevb.80.094522" @default.
• W2022226732 hasPublicationYear "2009" @default.
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