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

References in corpus (14)

• Valley polarization in MoS2 monolayers by optical pumping
• The Valley Hall Effect in MoS2 Transistors
• k.p theory for two-dimensional transition metal dichalcogenide semiconductors
• Gate-tunable Memristive Phenonmena Mediated by Grain Boundaries in Single Layer MoS2
• Fulde-Ferrell-Larkin-Ovchinnikov State in Heavy Fermion Superconductors
• Possible Topological Superconducting Phases of MoS${}_2$
• First-principles theory of field-effect doping in transition-metal dichalcogenides: Structural properties, electronic structure, Hall coefficient, and electrical conductivity
• Electrostatically Induced Superconductivity at the Surface of WS${}_2$
• Unconventional superconductivity in bilayer transition metal dichalcogenides
• Anomalous Upper Critical Field in CeCoIn_5/YbCoIn_5 Superlattices with a Rashba-type Heavy Fermion Interface
• Phase Diagram of Electron Doped Dichalcogenides
• Controllable Rashba spin-orbit interaction in artificially engineered superlattices involving the heavy-fermion superconductor CeCoIn5
• Superconducting dome in MoS2 and TiSe2 generated by quasiparticle-phonon coupling
• Two-Dimensional Valley Electrons and Excitons in Noncentrosymmetric 3R MoS${}_2$

Cited by in corpus (3)

• Superconductivity in disordered locally noncentrosymmetric materials: an application to CeRh${}_2$As${}_2$
• Multiple odd-parity superconducting phases in bilayer transition metal dichalcogenides
• Hybrid skyrmion and anti-skyrmion phases in polar $C_{4v}$ systems