Experimental Demonstration of Acoustic Chern Insulators
Experimental Demonstration of Acoustic Chern Insulators
复制标题
声学陈绝缘体的实验演示
DOI：
10.1103/physrevlett.122.014302
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发表时间：
2019-01-09
影响因子：
8.6
通讯作者：
Cheng, Jianchun
中科院分区：
文献类型：
--
作者：
Ding, Yujiang;Peng, Yugui;Cheng, Jianchun
本文报道了一种利用洛仑兹互易性破缺的角动量偏置谐振器阵列实现的声学化学绝缘体（ACI）。利用组成转子的高Q因子共振来降低所需的旋转速度。ACI是一种基于有效磁场的新型拓扑声学系统，类似于电子量子霍尔绝缘体。实验结果表明，具有稳定和均匀的元流体流偏置的ACI支持在其边缘的单向非互易传输的声音，这是拓扑免疫的各种类型的缺陷。我们的工作开辟了探索独特的可观察的拓扑相位和开发基于拓扑绝缘体的声学非互易器件的机会。
We report the experimental realization of an acoustic Chem insulator (ACI), by using an angularmomentum-biased resonator array with the broken Lorentz reciprocity. High Q-factor resonance of the constituent rotors is leveraged to reduce the required rotation speed. ACI is a new topological acoustic system analogous to the electronic quantum Hall insulator, based on an effective magnetic field. Experimental results show that the ACI featured with a stable and uniform metafluid flow bias supports one-way nonreciprocal transport of sound at its edges, which is topologically immune to various types of defects. Our work opens up opportunities for exploring unique observable topological phases and developing topological-insulator-based nonreciprocal devices in acoustics.