Acoustic Valley Spin Chern Insulators
Acoustic Valley Spin Chern Insulators
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DOI：
10.1103/physrevapplied.16.014058
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发表时间：
2021-07
影响因子：
4.6
通讯作者：
Zhenxiao Zhu;Mou Yan;Jincheng Pan;Yating Yang;Weiyin Deng;Jiuyang Lu;Xueqin Huang;Zhengyou Liu
中科院分区：
文献类型：
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作者：
Zhenxiao Zhu;Mou Yan;Jincheng Pan;Yating Yang;Weiyin Deng;Jiuyang Lu;Xueqin Huang;Zhengyou Liu
经典波的谷拓扑相和输运现象引起了人们的广泛关注。我们在正方晶格的双层声子晶体中实现了谷自旋Chern绝缘体，其拓扑不变量由具有层赝自旋的谷自旋Chern数描述。通过调节腔体的高度，可以实现四种非平凡的拓扑相位，这四种拓扑相位可以导致层混合、层极化和层锁定的声学扭结态。有趣的是，我们实验证明了异常层相关的分区运输的声学扭结态在交叉点构成的不同的拓扑相位。通过利用额外的层赝自旋，我们的系统提供了一个强大的平台，从其中探索有趣的拓扑声学性质，并有潜在的应用程序的声音操纵。
The valley topological phases and transport phenomena for classical waves have attracted a great deal of attention. We realize valley spin Chern insulators in bilayer phononic crystals of a square lattice, whose topological invariants are described by the valley spin Chern numbers with the layer pseudospin. Four types of nontrivial topological phases can be realized by tuning the heights of cavities, which can result in the layer-mixed, layer-polarized, and layer-locked acoustic kink states. Interestingly, we experimentally demonstrate the anomalous layer-dependent partition transports of the acoustic kink states at the intersection constituted by the distinct topological phases. By taking advantage of the additional layer pseudospin, our systems provide a powerful platform from which to explore the intriguing properties of topological acoustics, and have potential applications for sound manipulation.