Signatures of Topological Phonons in Superisostatic Lattices.
Signatures of Topological Phonons in Superisostatic Lattices.
复制标题
超均衡晶格中拓扑声子的特征。
DOI：
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发表时间：
2019
影响因子：
8.6
通讯作者：
T. Lubensky
中科院分区：
文献类型：
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作者：
O. Stenull;T. Lubensky
二维配位数为z=2d的理想球-弹簧晶格中的软拓扑表面声子在二维配位数为z>的物理可实现超均衡晶格中成为有限频率表面声子。我们在模型晶格中研究了这些有限频率模式，并在节点处添加了次近邻弹簧或弯曲力，同时着眼于保留在物理晶格中的拓扑表面模式的特征。我们的研究结果适用于用现代印刷技术制备的超材料晶格，这种晶格非常接近等静力。
Soft topological surface phonons in idealized ball-and-spring lattices with coordination number z=2d in d dimensions become finite-frequency surface phonons in physically realizable superisostatic lattices with z>2d. We study these finite-frequency modes in model lattices with added next-nearest-neighbor springs or bending forces at nodes with an eye to signatures of the topological surface modes that are retained in the physical lattices. Our results apply to metamaterial lattices, prepared with modern printing techniques, that closely approach isostaticity.