Spin waves in a nearly flat Haldane-Hubbard band become topological when the band develops dispersion, giving acoustic magnons with Chern number ±1 and chiral in-gap modes.
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Itinerant topological magnons in Haldane Hubbard model with a nearly-flat electron band
Spin waves in a nearly flat Haldane-Hubbard band become topological when the band develops dispersion, giving acoustic magnons with Chern number ±1 and chiral in-gap modes.