Odd-parity superconductivity in bilayer transition metal dichalcogenides

Abstract

Spin-orbit coupling in transition metal dichalcogenides (TMDCs) causes spin-valley locking giving rise to unconventional optical, transport, and superconducting properties. In this paper, we propose exotic superconductivity in bilayer group-IV TMDCs by symmetry control. The sublattice-dependent hidden spin-orbit coupling arising from local inversion symmetry breaking in the crystal structure may stabilize the odd-parity superconductivity by purely $s$-wave local pairing interaction. The stability of the odd-parity superconducting state depends on the bilayer stacking. The 2H${}_b$ stacking in MoX${}_2$ and WX${}_2$ (X =S, Se) favors the odd-parity superconductivity due to interlayer quantum interference. On the other hand, the odd-parity superconductivity is suppressed by the 2H${}_a$ stacking of NbSe${}_2$. Calculating the phase diagram of the tight-binding model derived from first principles band calculations, we conclude that the intercalated bilayer MoS${}_2$ and WS${}_2$ are candidates for a new class of odd-parity superconductors by spin-orbit coupling.

To appear in Phys. Rev. B

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• Even-odd parity transition in strongly correlated locally noncentrosymmetric superconductors : An application to CeRh${}_2$As${}_2$
• Superconductivity in disordered locally noncentrosymmetric materials: an application to CeRh${}_2$As${}_2$
• Orbital Fulde-Ferrell pairing state in moiré Ising superconductors
• Supercurrent-induced topological phase transitions
• Superconductivity of anomalous pseudospin
• Orbital effect on intrinsic superconducting diode effect
• Pseudo-Ising superconductivity induced by $p$-wave magnetism
• Multiple odd-parity superconducting phases in bilayer transition metal dichalcogenides
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• Hybrid skyrmion and anti-skyrmion phases in polar $C_{4v}$ systems
• Bardasis-Schrieffer-like phase mode in a superconducting bilayer
• Superconducting meron phase in locally noncentrosymmetric superconductors
• Reciprocal and nonreciprocal paraconductivity in bilayer multiphase superconductors
• Extremely high upper critical field in BiCh${}_2$-based (Ch: S and Se) layered superconductor LaO${}_{0.5}$F${}_{0.5}$BiS${}_{2-x}$Se${}_x$ ($x$ = 0.22 and 0.69)
• Quasiclassical theory of vortex states in locally non-centrosymmetric superconductors: application to CeRh${}_2$As${}_2$
• Field resilient superconductivity in atomic layer crystalline materials