Singlet, triplet, and pair density wave superconductivity in the doped triangular-lattice moiré system

Feng Chen; D. N. Sheng

doi:10.1103/PhysRevB.108.L201110

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Singlet, triplet, and pair density wave superconductivity in the doped triangular-lattice moiré system

Feng Chen, D. N. Sheng

DOI 10.1103/PhysRevB.108.L201110 · Physical Review B

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Abstract

Recent experimental progress has established the twisted bilayer transition metal dichalcogenide (TMD) as a highly tunable platform for studying many-body physics. Particularly, the homobilayer TMDs under displacement field are believed to be described by a generalized triangular-lattice Hubbard model with a spin-dependent hopping phase θ. To explore the effects of θ on the system, we perform density matrix renormalization group calculations for the relevant triangular lattice t-J model. By changing θ at small hole doping, we obtain a region of quasi-long-range superconducting order coexisting with charge and spin density wave within 0<θ<π/3. The superconductivity is composed of a dominant spin singlet d-wave and a subdominant triplet p-wave pairing. Intriguingly, the Sz=±1 triplet pairing components feature pair-density waves. In addition, we find a region of triplet superconductivity coexisting with charge-density wave and ferromagnetism within π/3<θ<2π/3, which is related to the former phase at smaller θ by a combined operation of spin-flip and gauge transformation. Our findings provide insights and directions for experimental search for exotic superconductivity in twisted TMD systems.