Gate-tunable giant superconducting nonreciprocal transport in few-layer Td-MoTe2

Abstract

We demonstrate gate-tunable giant field-dependent nonreciprocal transport (magnetochiral anisotropy) in a noncentrosymmetric superconductor Td-MoTe2 in the thin limit. Giant magnetochiral anisotropy (MCA) with a rectification coefficient (or a figure of merit) γ=3.1×106T-1A-1 is observed at 230 mK, below the superconducting transition temperature (Tc). 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) Td-MoTe2, 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.