There are two classes of phononic structures that can support elastic waves with non-conventional topology. namely intrinsic and extrinsic systems. The non-conventional topology of elastic wave results from breaking time reversal symmetry (T-symmetry) of wave propagation. In extrinsic systems. https://www.bekindtopets.com/best-grab-Christmas-Let-s-Get-Crackin-Unisex-NuBlend-Crew-Sweatshirt-hot-buy/
One-Dimensional Mass-Spring Chains Supporting Elastic Waves with Non-Conventional Topology
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