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.
For both parameter choices the band inversions occur, which opens a gap and generates a Chern number ofC= 4 in the lowest pair of degenerate bands
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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.