Asymmetric edge supercurrents in MoTe 2 Josephson junctions.

To investigate the higher order topology in MoTe 2 , the supercurrent interference phenomena in Nb/MoTe 2 /Nb planar Josephson junctions have been systematically studied. By analyzing the obtained interference pattern of the critical supercurrents and performing a comparative study of the edge-touched and untouched junctions, it's found that the supercurrent is dominated by the edges, rather than the bulk or surfaces of MoTe 2 . An asymmetric Josephson effect with a field-tunable sign is also observed, indicating the nontrivial origin of the edge states. These results not only provide initial evidence for the hinge states in the higher order topological insulator MoTe 2 , but also demonstrate the potential applications of MoTe 2 -based Josephson junctions in rectifying the supercurrent.