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- W2801681716 abstract "We studied the real space structure of states in twisted bilayer graphene at the `magic angle' $theta = 1.08^circ$. The flat bands close to charge neutrality are composed of a mix of `ring' and `center' orbitals around the AA stacking region. An effective model with localized orbitals is constructed, which necessarily includes more than just the four flat bands. Long-range Coulomb interaction causes a charge-transfer at half-filling of the flat bands from the `center' to the `ring' orbitals. Consequently, the Mott phase is a featureless spin-singlet paramagnet. We estimate the effective Heisenberg coupling that favors the singlet coupling to be $J = 3.3$ K, consistent with experimental values. The superconducting state depends on the nature of the dopants: hole-doping yields $p+ip$-wave whereas electron-doping yields $d+id$-wave pairing symmetry." @default.
- W2801681716 created "2018-05-17" @default.
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- W2801681716 date "2018-12-26" @default.
- W2801681716 modified "2023-10-17" @default.
- W2801681716 title "Charge-transfer insulation in twisted bilayer graphene" @default.
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- W2801681716 doi "https://doi.org/10.1103/physrevb.98.235158" @default.
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