Gate-tunable giant superconducting nonreciprocal transport in few-layer $T_{\mathrm{d}}$-MoTe${}_2$

Abstract

We demonstrate gate-tunable giant field-dependent nonreciprocal transport (magnetochiral anisotropy) in a noncentrosymmetric superconductor $T_{\mathrm{d}}$-MoTe${}_2$ in the thin limit. Giant magnetochiral anisotropy (MCA) with a rectification coefficient $\gamma$ = $3.1\times 10^6$ 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 is likely attributed to the reduced symmetry of the crystal structure. The temperature dependence of $\gamma$ indicates that the ratchet-like motion of magnetic vortices is the origin of the MCA, as supported by our theoretical model. For bilayer $T_{\mathrm{d}}$-MoTe${}_2$, we successfully perform gate control of the MCA and realize threefold modulation of $\gamma$. Our experimental results provide a new route to realizing electrically controllable superconducting rectification devices in a single material.

arXiv comment14 pages, 12 figures

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• Systematic study of superconductivity in few-layer $T_d$-MoTe${}_2$
• Robustness of the Kohn-Luttinger mechanism against symmetry breaking
• Nonreciprocal charge transport in an iron-based superconductor with broken inversion symmetry engineered by a hydrogen-concentration gradient
• Unveiling a Hidden Percolation Transition in Monitored Clifford Circuits: Inroads from ZX-Calculus