In a minimal Hubbard model of an altermagnet, a staggered potential creates a Chern number 1 quantum anomalous Hall state, and a perpendicular magnetic field creates a metastable Chern number 2 state.
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Two routes to quantum anomalous Hall states in altermagnets
In a minimal Hubbard model of an altermagnet, a staggered potential creates a Chern number 1 quantum anomalous Hall state, and a perpendicular magnetic field creates a metastable Chern number 2 state.