Topological Superconductivity in Twisted Multilayer Graphene
Cenke Xu, Leon Balents
DOI 10.1103/PhysRevLett.121.087001 · Physical Review Letters
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Abstract
We study a minimal Hubbard model for electronically driven superconductivity in a correlated flat miniband resulting from the superlattice modulation of a twisted graphene multilayer. The valley degree of freedom drastically modifies the nature of the preferred pairing states, favoring spin triplet d+id order with a valley singlet structure. We identify two candidates in this class, which are both topological superconductors. These states support half-vortices carrying half the usual superconducting flux quantum hc/(4e), and have topologically protected gapless edge states.
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