Supercurrent oscillations in Weyl Semimetal MoTe₂

MoTe₂ is a type-II Weyl semimetal with intrinsic superconductivity and pressure-induced superconductivity. Our interest is in the superconducting state at ambient pressure, with Tc around 100mK. We fabricated microscale MoTe₂ flakes with Au contacts by mechanical exfoliation and nanofabrication and measured their transport properties. We observed multiple peaks in the differential resistance (dV/dI) vs. bias current curves, and the positions of these peaks change periodically with magnetic field. Most samples show two kinds of oscillations, one is Fraunhofer Pattern (single slit diffraction) type with oscillation amplitude decreasing at high magnetic field, the other one is Young’s Interference Pattern (double-slit interference) type with oscillation amplitude not decreasing. The latter one (Young’s type) always has period corresponding to about 60% of the physical area of samples. We conclude that the latter one come from the edge of the crystals and indicating the existence of superconducting edge state in MoTe₂