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Correlation-Induced Triplet Pairing Superconductivity in Graphene-Based Moire ` Systems

TitleCorrelation-Induced Triplet Pairing Superconductivity in Graphene-Based Moire ` Systems
Publication TypeJournal Article
Year of Publication2021
AuthorsY-Z. Chou, F. Wu, J. D. Sau, and S. Das Sarma
JournalPhys. Rev. Lett.
Date PublishedNOV 15
Type of ArticleArticle

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 correlationinduced 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 moire systems, which is fundamentally distinct from triplet superconductivity in 3He and ferromagnetic superconductors.