Evidence for an edge supercurrent in the Weyl superconductor MoTe2

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.

Source: ScienceNOW - April 29, 2020 Category: Science Authors: Wang, W., Kim, S., Liu, M., Cevallos, F. A., Cava, R. J., Ong, N. P. Tags: Physics reports Source Type: news