The magnon bands of an anisotropic-exchange ferromagnetic zigzag lattice carry Chern numbers ±1 exactly when the ratios α=|J1y-J2y|/|J1x-J2x| and β=|J1y+J2y|/|J1x+J2x| straddle 1, giving defect-robust chiral edge magnons.
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Topological Magnons on the Ferromagnetic Zigzag Lattice
The magnon bands of an anisotropic-exchange ferromagnetic zigzag lattice carry Chern numbers ±1 exactly when the ratios α=|J1y-J2y|/|J1x-J2x| and β=|J1y+J2y|/|J1x+J2x| straddle 1, giving defect-robust chiral edge magnons.