Fully Polarized Topological Isostatic Metamaterials in Three Dimensions,Physical Review Letters

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Fully Polarized Topological Isostatic Metamaterials in Three Dimensions
Physical Review Letters ( IF 8.1 ) Pub Date : 2024-09-03 , DOI: 10.1103/physrevlett.133.106101
Zheng Tang ₁ , Fangyuan Ma ₁ , Feng Li ₁ , Yugui Yao ₁ , Di Zhou ₁

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Topological surface states are unique to topological materials and are immune to disturbances. In isostatic lattices, mechanical topological floppy modes exhibit softness depending on the polarization relative to the terminating surface. However, in three dimensions, the polarization of topological floppy modes is disrupted by the ubiquitous mechanical Weyl lines. Here, we demonstrate, both theoretically and experimentally, the fully polarized topological mechanical phases free of Weyl lines. Floppy modes emerge exclusively on a particular surface of the three-dimensional isostatic structure, leading to the strongly asymmetric stiffness between opposing boundaries. Additionally, uniform soft strains can reversibly shift the lattice configuration to Weyl phases, switching the stiffness contrast to a trivially comparable level. Our work demonstrates the fully polarized topological mechanical phases in three dimensions, and paves the way towards engineering soft and adaptive metamaterials.

中文翻译：

三维全极化拓扑等静压超材料

拓扑表面态是拓扑材料所独有的，并且不受干扰。在等静压晶格中，机械拓扑软盘模式表现出的柔软度取决于相对于终止表面的极化。然而，在三维空间中，拓扑软盘模式的极化被无处不在的机械韦尔线所破坏。在这里，我们从理论上和实验上证明了没有韦尔线的完全极化拓扑机械相。软盘模式仅出现在三维均衡结构的特定表面上，导致相对边界之间的强烈不对称刚度。此外，均匀的软应变可以将晶格构型可逆地转变为外尔相，将刚度对比切换到一个相当可比的水平。我们的工作展示了三个维度的完全极化拓扑机械相，并为工程软和自适应超材料铺平了道路。

更新日期：2024-09-04

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