| 王苏豪,贾晗,张艺檬,李晓东.声学高阶拓扑棱态之间的选择性输运*[J].,2025,44(2):276-283 |
| 声学高阶拓扑棱态之间的选择性输运* |
| Selective transport between acoustic higher-order topological hinge states |
| 投稿时间：2023-11-03 修订日期：2025-03-07 |
| 中文摘要: |
| 多维空间中对于声波的精确操控一直是声学领域的核心问题之一,固体物理中拓扑能带理论的发展以及声学人工带隙材料的应用为这一问题提供了新的物理见解。本文提出了一种具有双层六角构型的人工声学晶格,在三维空间下实现了高阶拓扑棱态—棱态之间的选择性输运。理论计算与数值仿真表明,多个独立方向上的拓扑棱态起源于人工晶格中存在的拓扑阻碍(topological obstruction)机制以及Jackiw-Rebbi机制的协同作用,并且在构成人工晶格的不同域中还存在着群速度相反的棱态模式。基于这些发现,我们通过对由四种不同域组成三维复合结构进行有限元仿真,证实了特定频率下的声波可以很好地局域在三种独立的一维棱上,在不同的棱之间以几乎无散射方式的绕过结构中的尖锐弯曲传播。此外,局域在棱上的声波根据入射波矢的方向可以被选择性的激发,表现出一种拓扑单向性。这些独特的声波输运性质有望应用于声场智能控制,声学通信,超声无损检测等领域。 |
| 英文摘要: |
| One of the core challenges in the field of acoustics has been the precise manipulation of sound waves in multi-dimensional space. With the development of topological band theory in solid-state physics and the application of acoustical artificial bandgap materials, new physical insights have been provided for this issue. The paper introduces an artificial acoustic lattice with a bilayer hexagonal configuration, achieving selective transport of high-order topological hinge states within three-dimensional space. Theoretical calculations and numerical simulations demonstrate that topological hinge states in multiple independent directions originate from the cooperative interplay of topological obstruction and the Jackiw-Rebbi mechanism within the artificial lattice Moreover, different domains of the artificial lattice exhibit hinge states with opposite group velocities. Building upon these findings, the paper employs finite element simulations on a three-dimensional composite structure composed of four different domains to confirm that at specific frequencies, sound waves can effectively localize on three distinct independent one-dimensional hinges, propagating with minimal scattering even around sharp bends in the structure. Furthermore, localized sound waves on these hinges can be selectively excited based on the position of the sound source, manifesting a form of topological unidirectionality. This research holds promise for applications in intelligent sound field control, acoustic communication, ultrasound non-destructive testing, and related fields. |
| DOI：10.11684/j.issn.1000-310X.2025.02.002 |
| 中文关键词: 拓扑声学 高阶拓扑棱态 选择性输运 |
| 英文关键词: topological acoustics higher-order hinge states selective transport |
| 基金项目:广东省重点领域研发计划项目(2020B010190002), 国家自然科学基金项目(11874383,12104480), 中国科学院声学研究所前沿探索项目(QYTS202110) |
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