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Evidence for an edge supercurrent in the Weyl superconductor MoTe 2

https://doi.org/10.1126/science.aaw9270

Wang, Wudi ; Kim, Stephan ; Liu, Minhao ; Cevallos, F. A. ; Cava, R. J. ; Ong, N. P. ( April 2020 , Science)

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 fieldB, fluxoid quantization generates a periodic modulation of the edge condensate observable as a “fast-mode” oscillation of the critical currentI_cversusB. 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.

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