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二维声学系统中的拓扑相变及边界传输

Topological phase transition and edge states in two-dimensional acoustic systems

  • 摘要: 拓扑声学的发现产生了一种可以有效抑制反射的声学边界传输态,不仅让人们重新认识了声传输现象,也扩展了声学新原理功能器件的研究领域。文章将介绍二维系统中拓扑声学的基本概念以及一些拓扑非平庸体系。主要关注利用背景流体构造的声类量子霍尔效应,利用共振耦合环形波导构造Floquet拓扑绝缘体,声类量子自旋霍尔效应以及声谷霍尔效应等。

     

    Abstract: The discovery of topological acoustics has revolutionized the fundamental concepts of sound propagation, giving rise to strikingly unconventional acoustic edge modes immune to scattering. In this review we introduce the concept of topological acoustics and several topologically nontrivial states in two-dimensional acoustic systems. We mainly focus on the phononic quantum Hall effects based on circulating flow, Floquet topological insulators based on coupled resonator ring waveguides, phononic topological insulators mimicking quantum spin Hall effects and the phononic valley Hall effects.

     

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