Department of Physics, Princeton University, Princeton, NJ 08544, USA.
Department of Chemistry, Princeton University, Princeton, NJ 08544, USA.
Science. 2020 May 1;368(6490):534-537. doi: 10.1126/science.aaw9270.
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 (MoTe). In a magnetic field , fluxoid quantization generates a periodic modulation of the edge condensate observable as a "fast-mode" oscillation of the critical current versus 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.
在超导体中，边缘超导电流一直是一个难以捉摸的目标。在拓扑超导的背景下，人们对其再次产生了兴趣。我们报告了在 Wey 超导体二碲化钼（MoTe）中存在稳健的边缘超导电流的证据。在磁场中，磁通量子化会产生边缘凝聚物的周期性调制，表现为临界电流相对于的“快模”振荡。快模频率与体超导电流显示的传统夫琅和费振荡明显不同。我们证实，快模频率随着晶体面积的增加而增加，这是边缘超导电流的预期结果。此外，还解析出了较弱的激发分支，它们显示出异常的破对称。
