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Based on an all-band moir\'e Hartree-Fock variational method, the authors study theoretically the correlated and topological states in magic-angle twisted bilayer graphene. They construct phase diagrams at various integer fillings. In particular, a so far unknown quantum state of matter, the moir\'e orbital antiferromagnetic state, is identified as the possible ground state at some fillings.
Liu et al. (Mon,) studied this question.