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Large box linear spin wave theory (LSWT) simulations of CrSBr with lattice 12 unit cells along b. The surface magnon modes are plotted in red, while the bulk magnon modes are plotted in blue. When D 1 becomes nonzero, the surface modes split and have linear crossings at integer and half‐integer h, signaling potential chiral edge modes with opposite group velocities on opposing edges.
