Bloch eigenmodes of PT-symmetric three-band topological insulators braid in sequences fixed by quaternion invariants; the effect is realized in coupled acoustic cavities with a synthetic dimension.
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Topological Braiding of Bloch Eigenmodes Protected by Non-Abelian Quaternion Invariants
Bloch eigenmodes of PT-symmetric three-band topological insulators braid in sequences fixed by quaternion invariants; the effect is realized in coupled acoustic cavities with a synthetic dimension.