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Unconventional Superconductivity and Density Waves in Twisted Bilayer Graphene
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Unconventional Superconductivity and Density Waves in Twisted Bilayer Graphene
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Journal Article
Unconventional Superconductivity and Density Waves in Twisted Bilayer Graphene
2018
Overview
We study electronic ordering instabilities of twisted bilayer graphene around the filling ofn=2electrons per supercell, where correlated insulator state and superconductivity have been recently observed. Motivated by the Fermi surface nesting and the proximity to Van Hove singularity, we introduce a hot-spot model to study the effect of various electron interactions systematically. Using the renormalization group method, we find thatdorp-wave superconductivity and charge or spin density wave emerge as the two types of leading instabilities driven by Coulomb repulsion. The density-wave state has a gapped energy spectrum aroundn=2and yields a single doubly degenerate pocket upon doping ton>2. The intertwinement of density wave and superconductivity and the quasiparticle spectrum in the density-wave state are consistent with experimental observations.
Publisher
American Physical Society,American Physical Society (APS)
