Correlation-Induced Triplet Pairing Superconductivity in Graphene-Based Moiré Systems

Yang-Zhi Chou; Fengcheng Wu; Jay D. Sau; Sankar Das Sarma

doi:10.1103/PhysRevLett.127.217001

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Correlation-Induced Triplet Pairing Superconductivity in Graphene-Based Moiré Systems

Yang-Zhi Chou, Fengcheng Wu, Jay D. Sau, Sankar Das Sarma

DOI 10.1103/PhysRevLett.127.217001 · Physical Review Letters

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Abstract

Motivated by the possible non-spin-singlet superconductivity in the magic-angle twisted trilayer graphene experiment, we investigate the triplet-pairing superconductivity arising from a correlation-induced spin-fermion model of Dirac fermions with spin, valley, and sublattice degrees of freedom. We find that the f-wave pairing is favored due to the valley-sublattice structure, and the superconducting state is time-reversal symmetric, fully gapped, and nontopological. With a small in-plane magnetic field, the superconducting state becomes partially polarized, and the transition temperature can be slightly enhanced. Our results apply qualitatively to Dirac fermions for the triplet-pairing superconductivity in graphene-based moiré systems, which is fundamentally distinct from triplet superconductivity in He3 and ferromagnetic superconductors.