A single π-flux defect in a bilayer acoustic metamaterial lattice hosts robust topological defect modes protected by mirror and chiral symmetries, confirmed by bulk-defect invariants and experiment.
Observation of a phononic quadrupole topological insulator,
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Single $\pi$-flux hosting topological defect modes in bilayer acoustic metamaterials
A single π-flux defect in a bilayer acoustic metamaterial lattice hosts robust topological defect modes protected by mirror and chiral symmetries, confirmed by bulk-defect invariants and experiment.