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 γ = 3.1×106 T−1 A−1, is observed at 230 mK, below the superconducting transition temperature (Tc). This is one of the largest values reported so far and is likely attributed to the reduced symmetry of the crystal structure. The temperature dependence of γ indicates that the ratchet-like motion of magnetic vortices is the origin of the MCA, as supported by our theoretical model. For bilayer Td-MoTe2, we successfully perform gate control of the MCA and realize threefold modulation of γ. Our experimental results provide a new route to realizing electrically controllable superconducting rectification devices in a single material.
@article{arxiv.2303.09747,
title = {Gate-tunable giant superconducting nonreciprocal transport in few-layer $T_{\rm d}$-MoTe$_2$},
author = {T. Wakamura and M. Hashisaka and S. Hoshino and M. Bard and S. Okazaki and T. Sasagawa and T. Taniguchi and K. Watanabe and K. Muraki and N. Kumada},
journal= {arXiv preprint arXiv:2303.09747},
year = {2024}
}