Topological surface phonons in isostatic lattices with z=2d become finite-frequency surface phonons in superisostatic lattices with z>2d when next-nearest-neighbor springs or bending forces are added.
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Signatures of Topological Phonons in Superisostatic Lattices
Topological surface phonons in isostatic lattices with z=2d become finite-frequency surface phonons in superisostatic lattices with z>2d when next-nearest-neighbor springs or bending forces are added.