Acoustic rainbow trapping effect of double corner states in higher-order topological insulators

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-07-16 DOI:10.1063/5.0273381

Dongfeng Sha, Rongli Wang, Jinlong Luo, Jian Huang, Hai Yang

引用次数: 0

Abstract

Higher-order topological insulators are a type of topological state of matter, which break the traditional bulk-edge correspondence principle. At the same time, the concept of higher-order topological states in condensed matter physics has rapidly extended to acoustic and optical systems and provided a new degree of freedom for controlling classical waves. However, capturing higher-order topological states of distinct frequencies at different geometric angles in acoustic systems remains a challenging problem. Based on sonic crystals with the “breathing” Kagome lattices, we theoretically and experimentally realize the acoustic rainbow trapping effect of double corner states. The Wannier centers of the upward and downward triangles are not in the same positions, which is conducive for arbitrarily adjusting the positions of the higher-order topological states. Our results offer a method for capturing multi-frequency acoustic waves and enhance the applications of higher-order topological states.

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高阶拓扑绝缘体双角态的声彩虹捕获效应

高阶拓扑绝缘体是物质的一种拓扑状态，它打破了传统的体边对应原理。同时，凝聚态物理中高阶拓扑态的概念迅速扩展到声学和光学系统，为控制经典波提供了新的自由度。然而，在声学系统中捕捉不同几何角度下不同频率的高阶拓扑状态仍然是一个具有挑战性的问题。基于具有“呼吸”Kagome晶格的声波晶体，我们从理论上和实验上实现了双角态的声彩虹捕获效应。上下三角形的万尼尔中心不在同一位置，这有利于任意调整高阶拓扑态的位置。我们的研究结果提供了一种捕获多频声波的方法，并增强了高阶拓扑态的应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.