Elastic Weyl Points and Surface Arc States in Three-Dimensional Structures
Elastic Weyl Points and Surface Arc States in Three-Dimensional Structures
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DOI：
10.1103/physrevapplied.12.024058
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发表时间：
2019-08
影响因子：
4.6
通讯作者：
Xiaotian Shi;R. Chaunsali;Feng Li;Jinkyu Yang
中科院分区：
文献类型：
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作者：
Xiaotian Shi;R. Chaunsali;Feng Li;Jinkyu Yang
电子系统中Weyl点的研究启发了许多最近在经典系统中的研究，如光子和声学格子。在这里，我们展示了Weyl物理学如何也能启发新型弹性结构的设计。我们构造了一个类似于AA叠层蜂窝晶格的单相三维结构，并预测了具有相反拓扑电荷(±1)的Weyl点、弹性费米弧和相关的无间隙拓扑保护表面态的存在。我们对弹性三维结构进行了全尺度的数值模拟，给出了具有方向性和健壮性的拓扑表面态的清晰可视化。这种设计的晶格可以为在许多工程应用中普遍存在的结构上的新型振动控制和能量收集铺平道路。
The study of Weyl points in electronic systems has inspired much recent research in classical systems such as photonic and acoustic lattices. Here we show how Weyl physics can also inspire the design of novel elastic structures. We construct a single-phase three-dimensional structure, an analog of the AAstacked honeycomb lattice, and predict the existence of Weyl points with opposite topological charges (±1), elastic Fermi arcs, and the associated gapless topologically protected surface states. We apply fullscale numerical simulations on the elastic three-dimensional structure and present a clear visualization of topological surface states that are directional and robust. Such designed lattices can pave the way for novel vibration control and energy harvesting on structures that are ubiquitous in many engineering applications.