Transport evidence of asymmetric spin-orbit coupling in few$-$layer superconducting 1Td$-$MoTe${}_2$

Abstract

Two-dimensional (2D) transition metal dichalcogenides (TMDCs) MX2 (M=W, Mo, Nb, and X=Te, Se, S) with strong spin-orbit coupling (SOC) possess plenty of novel physics including superconductivity. Due to the Ising SOC, monolayer NbSe${}_2$ and gated MoS${}_2$ of 2H structure can realize the Ising superconductivity phase, which manifests itself with in-plane upper critical field far exceeding Pauli paramagnetic limit. Surprisingly, we find that a few-layer 1Td structure MoTe${}_2$ also exhibits an in-plane upper critical field ($H_{c2,//}$) which goes beyond the Pauli paramagnetic limit. Importantly, the in-plane upper critical field shows an emergent two-fold symmetry which is different from the isotropic $H_{c2,//}$ in 2H structure TMDCs. We show that this is a result of an asymmetric SOC in 1Td structure TMDCs. The asymmetric SOC is very strong and estimated to be on the order of tens of meV. Our work provides the first transport evidence of a new type of asymmetric SOC in TMDCs which may give rise to novel superconducting and spin transport properties. Moreover, our findings mostly depend on the symmetry of the crystal and apply to a whole class of 1Td TMDCs such as 1Td-WTe${}_2$ which is under intense study due to its topological properties.

34 pages, 12 figures

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• Berezinskii-Kosterlitz-Thouless transition in the type-I Weyl semimetal PtBi${}_2$
• Prediction of ferroelectric superconductors with reversible superconducting diode effect
• Extrinsic and Intrinsic Anomalous Metallic States in Transition Metal Dichalcogenide Ising Superconductors
• Realization of multiple charge density waves in NbTe2 at the monolayer limit
• Protection of Ising spin-orbit coupling in bulk misfit superconductors
• Nematic Ising superconductivity with hidden magnetism in few-layer 6R-TaS2
• Quasi two-dimensional nature of high-Tc superconductivity in iron-based (Li,Fe)OHFeSe
• Observation of surface superconductivity in a three-dimensional Dirac material
• Topological Superconductivity in Monolayer T${}_{\text{d}}$-MoTe${}_2$
• Tunable critical field in Rashba superconductor thin-films
• Non-Hermitian superconducting diode effect
• Two-Fold Anisotropic Superconductivity in Bilayer T${}_d$-MoTe${}_2$
• Superconducting pairing symmetry in MoTe${}_2$
• Ising superconductivity in noncentrosymmetric bulk NbSe2
• Anomalously high supercurrent density in a two-dimensional topological material
• Discovery of smectic charge and pair-density-wave orders in topological monolayer 1T${}^{\prime }$-MoTe${}_2$
• Constructing the Fulde-Ferrell-Larkin-Ovchinnikov state in antiferromagnetic insulator CrOCl
• Nonlinear magnetotransport in MoTe${}_2$
• Nonreciprocal transport in U(1) gauge theory of high-Tc cuprates
• Thermodynamic parameters of atomically thin superconductors derived from the upper critical field
• Vertex correction for the linear and nonlinear optical responses in superconductors: multiband effect and topological superconductivity
• Systematic study of superconductivity in few-layer $T_d$-MoTe${}_2$
• Breaking the Trade-off: Bulk 2D Ising Superconductivity with High Tc and Giant Interlayer Spacing via a Unique Chain Intercalation in (BaS)1/3TaS2
• Third-order nonlinear transport in a percolative two-dimensional superconductor