Spin-orbit-enhanced robustness of supercurrent in graphene/WS${}_2$ Josephson junctions

Abstract

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${}_2$.

arXiv comment6 pages, 3 figures

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Cited by in corpus (7)

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• Planar graphene-NbSe${}_2$ Josephson junctions in a parallel magnetic field
• Emergent correlated phases in rhombohedral trilayer graphene induced by proximity spin-orbit and exchange coupling
• Majorana bound states in encapsulated bilayer graphene
• Swapping exchange and spin-orbit induced correlated phases in proximitized Bernal bilayer graphene
• Edge states in proximitized graphene ribbons and flakes in a perpendicular magnetic field: emergence of lone pseudohelical pairs and pure spin-current states
• Chiral spin channels in curved graphene $pn$ junctions