Observation of an edge supercurrent in the Weyl superconductor MoTe${}_2$

Abstract

Edge supercurrents in superconductors have long been an elusive target. Interest in them has reappeared in the context of topological superconductivity. We report the observation of a robust edge supercurrent in the Weyl superconductor 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. Remarkably, 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 which display an unusual broken symmetry.

8 pages, 4 figures

References in corpus (5)

• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Bipolar supercurrent in graphene
• Edge-mode Superconductivity in a Two Dimensional Topological Insulator
• Josephson effect in a Weyl SNS junction
• Andreev Reflection in Weyl Semimetals

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