Topological Transition in Spiral Elastic Valley Metamaterials
Topological Transition in Spiral Elastic Valley Metamaterials
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DOI：
10.1103/physrevapplied.15.014058
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发表时间：
2021-01-28
影响因子：
4.6
通讯作者：
Yang, Jinkyu
中科院分区：
文献类型：
--
作者：
Li, Shuaifeng;Yang, Jinkyu
弹性谷超材料为操纵弹性波提供了一个很好的平台，在能量采集和弹性成像方面具有潜在的应用前景。在这里，我们介绍了一系列通过参数调制来实现螺旋弹性谷超材料的拓扑转变的策略。我们给出了Berry曲率和谷陈恩数作为螺线固有参数的函数的演化，从而进一步得到了实现拓扑谷边缘状态的一般方案。我们的策略利用螺旋弹性山谷超材料中的多个自由度来为所需的拓扑状态提供更多的机会。
Elastic valley metamaterials offer an excellent platform to manipulate elastic waves and have potential applications in energy harvesting and elastography. Here we introduce a series of strategies to realize a topological transition in spiral elastic valley metamaterials by parameter modulations. We show the evolution of the Berry curvature and valley Chern number as a function of inherent parameters of a spiral, which further results in a general scheme to achieve topological valley edge states. Our strategy leverages multiple degrees of freedom in spiral elastic valley metamaterials to provide enhanced opportunities for desired topological states.