Evidence for an edge supercurrent in the Weyl superconductor MoTe2
- 1 May 2020
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 368 (6490), 534-+
- https://doi.org/10.1126/science.aaw9270
Abstract
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 l c 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.Funding Information
- National Science Foundation (DMR 1420541)
- Gordon and Betty Moore Foundation (GBMF4539)
- Gordon and Betty Moore Foundation (GBMF-4412)
- US Army Research Office ARO (W911NF-16-1- 0116)
- US Department of Energy DOE (DE-SC0017863)
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