Spin waves in monolayer and bilayer honeycomb ferromagnets are classified topologically, with edge states described by effective Su-Schrieffer-Heeger chains and nonzero Chern numbers induced by Dzyaloshinskii-Moriya interactions.
It means T+ = I2l is the identity ma- trix and leads toHσBdG in the classAI withη+, a trivial topological classification
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Topological classification and edge states of magnons in honeycomb ferromagnets
Spin waves in monolayer and bilayer honeycomb ferromagnets are classified topologically, with edge states described by effective Su-Schrieffer-Heeger chains and nonzero Chern numbers induced by Dzyaloshinskii-Moriya interactions.