In a Kondo model on the triangular lattice with nested pockets at Gamma and M, classical spins form stable chiral tetrahedral orders that gap the bands and produce a quantum anomalous Hall conductivity of 4e²/h.
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Matrix-product-state calculations on a correlated two-band model show a doping-induced in-gap branch tied to excitonic correlations.
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Chiral Magnetism and Quantum Anomalous Hall Effect in a Low-energy Kondo Model on the Triangular Lattice
In a Kondo model on the triangular lattice with nested pockets at Gamma and M, classical spins form stable chiral tetrahedral orders that gap the bands and produce a quantum anomalous Hall conductivity of 4e²/h.
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Correlation-driven branch in doped excitonic insulators
Matrix-product-state calculations on a correlated two-band model show a doping-induced in-gap branch tied to excitonic correlations.