Micromorphic continuum elasticity for critical mechanical metamaterials yields a topological invariant equal to the difference in zero-energy edge modes on opposing boundaries, with decay lengths set by the square of the surface wavelength.
-2 -1 0 1 2 Parameter space x ΔN Topological transition (a) rn rn (b) (c) FIG
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Topological elasticity of flexible structures
Micromorphic continuum elasticity for critical mechanical metamaterials yields a topological invariant equal to the difference in zero-energy edge modes on opposing boundaries, with decay lengths set by the square of the surface wavelength.