GW Theory of Magic-Angle Twisted Bilayer Graphene
arxiv(2024)
摘要
Strong correlations occur in magic-angle twisted bilayer graphene (MATBG)
when the octet of flat moiré minibands centered on charge neutrality (CN) is
partially occupied. The octet consists of a single valence band and a single
conduction band for each of four degenerate spin-valley flavors. Motivated by
the importance of Hartree electrostatic interactions in determining the
filling-factor dependent band structure, we use a time-dependent Hartree (GW)
approximation to gain insight into electronic correlations. We find that the
electronic compressibility is dominated by Hartree interactions, that
paramagnetic states are stable over a range of density near CN, and that the
dependence of energy on flavor polarization is strongly overestimated by
mean-field theory.
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