A Green's function perturbation theory in the band basis gives analytical Hartree-Fock ground states for twisted bilayer graphene and shows self-consistent GW corrections reduce compressibility oscillations.
Independently Tunable Flat Bands and Correlations in a Graphene Double Moir\'e System
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We report on a double moir\'e system consisting of four graphene layers, where the top and bottom pairs form small-twist-angle bilayer graphene, and the middle interface has a large rotational mismatch. This system shows clear signatures of two sets of spatially separated flat bands associated with the top and bottom twisted bilayer graphene (TBG) subsystems, each independently tunable. Thermodynamic analysis reveals weak correlations between layers that allow the chemical potential to be measured as a function of carrier density for each constituent TBG. We find that correlated insulating states at integer number of electrons per moir\'e unit cell are most robust near magic angle, whereas gapped states at neutrality are more robust at larger twist angles.
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Many-body perturbation theory for moir\'{e} systems
A Green's function perturbation theory in the band basis gives analytical Hartree-Fock ground states for twisted bilayer graphene and shows self-consistent GW corrections reduce compressibility oscillations.