Enhanced Superconductivity in Monolayer $T_d$-MoTe${}_2$ with Tilted Ising Spin Texture

Abstract

Crystalline two-dimensional (2D) superconductors with low carrier density are an exciting new class of materials in which superconductivity coexists with strong interactions, the effects of complex topology are not obscured by disorder, and electronic properties can be strongly tuned by electrostatic gating. Very recently, two such materials, 'magic-angle' twisted bilayer graphene and monolayer $T_d$-WTe${}_2$, have been reported to show superconductivity at temperatures near 1 K. Here we report superconductivity in semimetallic monolayer $T_d$-MoTe${}_2$. The critical temperature $T_{\text{c}}$ reaches 8 K, a sixty-fold enhancement as compared to the bulk. This anomalous increase in $T_{\text{c}}$ is only observed in monolayers, and may be indicative of electronically mediated pairing. Reflecting the low carrier density, the critical temperature, magnetic field, and current density are all tunable by an applied gate voltage, revealing a superconducting dome that extends across both hole and electron pockets. The temperature dependence of the in-plane upper critical field is distinct from that of $2H$ transition metal dichalcogenides (TMDs), consistent with a tilted spin texture as predicted by \textit{ab initio} theory.

References in corpus (15)

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• Bulk Fermi-surface of the Weyl type-II semi-metallic candidate MoTe2
• Hall-effect within the colossal magnetoresistive semi-metallic state of MoTe2
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Cited by in corpus (7)

• Enhancement of superconductivity in organic-inorganic hybrid topological materials
• Spin-orbit-parity coupled superconductivity in topological monolayer WTe${}_2$
• Magnetic field-induced "mirage" gap in an Ising superconductor
• Low-energy excitations in type-II Weyl semimetal Td-MoTe2 evidenced through optical conductivity
• Classifying induced superconductivity in atomically thin Dirac-cone materials
• A numerically exact study of Weyl superconductivity
• Switchable domains in point contacts based on transition metal tellurides