1. Spin-orbit-enhanced robustness of supercurrent in graphene/WS$_2$ Josephson junctions
- Author
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Wakamura, T., Wu, N. J., Chepelianskii, A. D., Guéron, S., Och, M., Ferrier, M., Taniguchi, T., Watanabe, K., Mattevi, C., and Bouchiat, H.
- Subjects
Condensed Matter - Mesoscale and Nanoscale Physics ,Condensed Matter - Superconductivity - 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$_2$., Comment: 6 pages, 3 figures
- Published
- 2020
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