Gate-tunable giant superconducting nonreciprocal transport in few-layer T_{d}-MoTe_{2}

Abstract

We demonstrate gate-tunable giant field-dependent nonreciprocal transport (magnetochiral anisotropy) in a noncentrosymmetric superconductor T_{d}-MoTe_{2} in the thin limit. Giant magnetochiral anisotropy (MCA) with a rectification coefficient (or a figure of merit) γ=3.1×10^{6}T^{−1}A^{−1} is observed at 230 mK, below the superconducting transition temperature (T_{c}). This is one of the largest values reported so far and may be attributed to the reduced symmetry of the crystal structure. The temperature dependence of γ indicates that ratchetlike motion of magnetic vortices is the origin of the MCA, as supported by our theoretical model. For bilayer (2 L) T_{d}-MoTe_{2}, we can successfully modulate γ by gating. Our experimental results provide a new route to realizing electrically controllable superconducting rectification devices in a single material.