Topologically protected one-way edge mode in networks of acoustic resonators with circulating air flow
Topologically protected one-way edge mode in networks of acoustic resonators with circulating air flow
复制标题
具有循环气流的声谐振器网络中拓扑保护的单向边缘模式
DOI：
10.1088/1367-2630/17/5/053016
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发表时间：
2015-05-13
影响因子：
3.3
通讯作者：
Chen, Yan-Feng
中科院分区：
文献类型：
--
作者：
Ni, Xu;He, Cheng;Chen, Yan-Feng
近年来，物理系统中拓扑结构的研究发展出了一种新的以拓扑保护态和相变为特征的凝聚态模型，例如，磁光效应使之成为可能的拓扑保护光子晶体。然而，在其他波系统，如声学，拓扑状态不能简单地复制，由于缺乏类似的磁性相关的声音物质相互作用在自然可用的材料。在这里，我们提出了一个声学拓扑结构，通过创建一个有效的规范磁场的声音使用循环流动的空气中设计的声学环形谐振器。所产生的规范磁场打破了时间反演对称性，因此拓扑性质可以被设计为具有非零陈数的非平凡的，从而实现拓扑声波晶体，其中观察到拓扑保护的声学边缘态输运，其特征在于针对各种拓扑缺陷和杂质的鲁棒单向传播特性。我们的研究结果打开了一个新的场地，非磁性拓扑结构，并承诺一个独特的方法来有效地操纵声界面输运的意愿。
Recent explorations of topology in physical systems have led to a new paradigm of condensed matters characterized by topologically protected states and phase transition, for example, topologically protected photonic crystals enabled by magneto-optical effects. However, in other wave systems such as acoustics, topological states cannot be simply reproduced due to the absence of similar magnetics-related sound–matter interactions in naturally available materials. Here, we propose an acoustic topological structure by creating an effective gauge magnetic field for sound using circularly flowing air in the designed acoustic ring resonators. The created gauge magnetic field breaks the time-reversal symmetry, and therefore topological properties can be designed to be nontrivial with non-zero Chern numbers and thus to enable a topological sonic crystal, in which the topologically protected acoustic edge-state transport is observed, featuring robust one-way propagation characteristics against a variety of topological defects and impurities. Our results open a new venue to non-magnetic topological structures and promise a unique approach to effective manipulation of acoustic interfacial transport at will.