Magic angles in the chiral model of twisted bilayer graphene are identified with parameters where the associated SU(2) gauge field flows to a Yang-Mills connection of unit flux, so flat bands occur with degeneracy 1 or 2, never 3, 6, 9.
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Yang-Mills flows for multilayered graphene
Magic angles in the chiral model of twisted bilayer graphene are identified with parameters where the associated SU(2) gauge field flows to a Yang-Mills connection of unit flux, so flat bands occur with degeneracy 1 or 2, never 3, 6, 9.