Topological phononic states of underwater sound based on coupled ring resonators
Topological phononic states of underwater sound based on coupled ring resonators
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DOI：
10.1063/1.4940403
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发表时间：
2016-01
影响因子：
4
通讯作者：
Cheng He;Zheng Li;Xu Ni;Xiao-Chen Sun;Si-Yuan Yu;Ming-Hui Lu;Xiao-ping Liu;Yan-Feng Chen
中科院分区：
文献类型：
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作者：
Cheng He;Zheng Li;Xu Ni;Xiao-Chen Sun;Si-Yuan Yu;Ming-Hui Lu;Xiao-ping Liu;Yan-Feng Chen
本文提出了一种利用声耦合环形谐振器阵列设计水声拓扑声子态的方法。在每个单独的环形谐振器中，对应于顺时针和逆时针传播的两个简并声学模式被视为相反的赝自旋。带隙中出现的无带隙边缘态导致受保护的赝自旋相关的声音传输，这是量子自旋霍尔效应的声子模拟。我们还研究了拓扑声态的鲁棒性，表明所观察到的赝自旋相关的声音传输仍然存在，除非引入的缺陷促进顺时针和逆时针模式之间的耦合（换句话说，原始模式简并被打破）。声传输的拓扑工程必将为下一代声器件特别是水声器件的导声与切换提供独特的设计方案。
We report a design of topological phononic states for underwater sound using arrays of acoustic coupled ring resonators. In each individual ring resonator, two degenerate acoustic modes, corresponding to clockwise and counter-clockwise propagation, are treated as opposite pseudospins. The gapless edge states arise in the bandgap resulting in protected pseudospin-dependent sound transportation, which is a phononic analogue of the quantum spin Hall effect. We also investigate the robustness of the topological sound state, suggesting that the observed pseudospin-dependent sound transportation remains unless the introduced defects facilitate coupling between the clockwise and counter-clockwise modes (in other words, the original mode degeneracy is broken). The topological engineering of sound transportation will certainly promise unique design for next generation of acoustic devices in sound guiding and switching, especially for underwater acoustic devices.