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- W4225712684 abstract "We study the possibility of charge order at quarter filling and antiferromagnetism at half-filling in a tight-binding model of magic angle twisted bilayer graphene. We build on the model proposed by Kang and Vafek [Physical Review X 8(3), 031088 (2018)], relevant to a twist angle of $1.30^circ$, and add on-site and extended density-density interactions. Applying the variational cluster approximation with an exact-diagonalization impurity solver, we find that the system is indeed a correlated (Mott) insulator at fillings $frac14$, $frac12$ and $frac34$. At quarter filling, we check that the most probable charge orders do not arise, for all values of the interaction tested. At half-filling, antiferromagnetism only arises if the local repulsion $U$ is sufficiently large compared to the extended interactions, beyond what is expected from the simplest model of extended interactions." @default.
- W4225712684 created "2022-05-05" @default.
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- W4225712684 date "2021-11-30" @default.
- W4225712684 modified "2023-09-24" @default.
- W4225712684 title "Charge order and antiferromagnetism in twisted bilayer graphene from the variational cluster approximation" @default.
- W4225712684 hasPublicationYear "2021" @default.
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