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Evidence for an edge supercurrent in the Weyl superconductor MoTe 2

2020; American Association for the Advancement of Science; Volume: 368; Issue: 6490 Linguagem: Inglês

10.1126/science.aaw9270

1095-9203

Wudi Wang, Stephan Kim, Minhao Liu, F. Alex Cevallos, R. J. Cava, N. P. Ong,

Graphene research and applications

Edge supercurrents in superconductors have long been an elusive target. Interest in them has reappeared in the context of topological superconductivity. We report evidence for the existence of a robust edge supercurrent in the Weyl superconductor molybdenum ditelluride (MoTe2). In a magnetic field B, fluxoid quantization generates a periodic modulation of the edge condensate observable as a "fast-mode" oscillation of the critical current Ic versus B The fast-mode frequency is distinct from the conventional Fraunhofer oscillation displayed by the bulk supercurrent. We confirm that the fast-mode frequency increases with crystal area as expected for an edge supercurrent. In addition, weak excitation branches are resolved that display an unusual broken symmetry.