【摘要】 声学超材料的概念在21世纪初被首次提出，为复杂介质中的声场调控提供了全新的思路和方法。其中，声波在声子晶体中产生的多重散射诱发了一系列伴随特殊色散关系的新颖物理现象。最近，在经典波系统中探究凝聚态物理拓扑效应吸引了越来越多的关注。声学超材料和声子晶体因具有精密且可控的加工手段和测量方法，为研究类拓扑效应提供了理想的实验平台，一系列有趣的厄米和非厄米拓扑效应在声学系统中得以实现。文章将介绍近年来在拓扑声学领域的部分研究工作，从拓扑声学的一些基本概念及实现方案出发，重点关注二维声学系统中的类高阶拓扑绝缘体、厄米/非厄米声拓扑系统以及拓扑声功能器件及应用等研究方向，最后对未来发展进行展望。更多还原

【Abstract】 The concept of acoustic metamaterials was first proposed at the beginning of the 21 st century, offering new ideas and methods for controlling acoustic fields in complex media. Therein, the multiple scattering of sound waves within the sonic/phononic crystals gives rise to a series of novel physical phenomena accompanied by unique dispersion relations. Recently, topological effects in condensed matter physics in classical wave systems have been drawing increased attentions. Acoustic metamaterials and sonic crystals provide an ideal experimental platform for studying topological effects, thanks to precise and controllable fabrication and measurement methods. A series of intriguing Hermitian and non-Hermitian topological effects have been realized in acoustic systems. The article reviews developments in the field of topological acoustics in recent years, starting from basic concepts and implementation schemes, and focuses on areas such as higher-order topological insulators, Hermitian/non-Hermitian topological systems, as well as functional topological acoustic devices and their applications in two-dimensional acoustic systems. Finally, an outlook on future development is provided.更多还原