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.
Fig- ure 6(a) shows the energy spectrum obtained from the rib- bon geometry calculation at h/t = 0.01, hx AF/t = 0.2, and λA/t = λR/t = 0.1
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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.