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- W3135977259 abstract "We implement a self-consistent Hartree-Fock approximation based on a microscopic model in real space, which allows us to consider the interplay between the Hubbard and the extended Coulomb interaction in twisted bilayer graphene at the magic angle. These two interactions tend to favor different symmetry breaking patterns, having therefore complementary roles in the regimes where one or the other dominates. We show that, for sufficiently large values of the on-site Hubbard repulsion, magic angle graphene has an antiferromagnetic ground state at the charge neutrality point, while at half-filling of the lowest valence band the state becomes fully spin-polarized. In general, a suitable screening of the extended Coulomb interaction is required to observe the magnetic state in either case, as otherwise the instabilities take place in the charge sector, preferentially in the form of time-reversal, chiral or valley symmetry breaking." @default.
- W3135977259 created "2021-03-29" @default.
- W3135977259 creator A5015027571 @default.
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- W3135977259 date "2021-09-07" @default.
- W3135977259 modified "2023-10-17" @default.
- W3135977259 title "Magnetic phases from competing Hubbard and extended Coulomb interactions in twisted bilayer graphene" @default.
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- W3135977259 doi "https://doi.org/10.1103/physrevb.104.115110" @default.
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