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Article Dans Une Revue Physical Review Letters Année : 2020

Spin-orbit-enhanced robustness of supercurrent in graphene / WS 2 Josephson junctions

Résumé

We demonstrate enhanced robustness of the supercurrent through graphene-based Josephson junctions in which strong spin-orbit interactions (SOIs) are induced. We compare the persistence of a supercurrent at high magnetic fields between Josephson junctions with graphene on hexagonal boron-nitride and graphene on WS$_2$, where strong SOIs are induced via the proximity effect. We find that in the shortest junctions both systems display signatures of induced superconductivity, characterized by a suppressed differential resistance at a low current, in magnetic fields up to 1 T. In longer junctions however, only graphene on WS$_2$ exhibits induced superconductivity features in such high magnetic fields, and they even persist up to 7 T. We argue that these robust superconducting signatures arise from quasi-ballistic edge states stabilized by the strong SOIs induced in graphene by WS$_2$.
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Dates et versions

hal-03435846 , version 1 (19-11-2021)

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T. Wakamura, N. j. Wu, A. d. Chepelianskii, S. Guéron, M. Och, et al.. Spin-orbit-enhanced robustness of supercurrent in graphene / WS 2 Josephson junctions. Physical Review Letters, 2020, 125, pp.266801. ⟨10.1103/PhysRevLett.125.266801⟩. ⟨hal-03435846⟩
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