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人工晶体学报 ›› 2025, Vol. 54 ›› Issue (11): 1937-1946.DOI: 10.16553/j.cnki.issn1000-985x.2025.0120

• 研究论文 • 上一篇    下一篇

凹六边形陀螺声子晶体的拓扑边界态研究

肖伟民1(), 聂京凯2, 赵俊娟1, 户文成1, 韩钰2, 石磊3   

  1. 1.北京市科学技术研究院城市安全与环境科学研究所,北京 100054
    2.中国电力科学研究院有限公司,北京 100192
    3.国网北京市电力公司,北京 100031
  • 收稿日期:2025-06-01 出版日期:2025-11-20 发布日期:2025-12-11
  • 作者简介:肖伟民(1983—),男,北京市人,博士,副研究员。E-mail:xiaoweimin2025@163.com
  • 基金资助:
    国家自然科学基金(12274038)

Topological Edge States of Concave Hexagonal Gyroscopic Phononic Crystals

XIAO Weimin1(), NIE Jingkai2, ZHAO Junjuan1, HU Wencheng1, HAN Yu2, SHI Lei3   

  1. 1. Institute of Urban Safety and Environmental Science,Beijing Academy of Science and Technology,Beijing 100054,China
    2. China Electric Power Research Institute Co. Ltd. ,Beijing 100192,China
    3. State Grid Beijing Electric Power Company,Beijing 100031,China
  • Received:2025-06-01 Online:2025-11-20 Published:2025-12-11

摘要: 陀螺超材料的研究为拓扑声学开辟了新方向。基于对结构中扭转波传播的研究,通过将陀螺结构引入凹六边形无限周期离散介质,提出了一种具有凹六边形晶格的陀螺声子晶体(GPC)。本文分析了GPC的带隙特性,讨论了陀螺力矩变化导致狄拉克锥打开和拓扑边界态产生的机制。随后,细致研究了陀螺转速对带隙的影响,发现了能带反转等现象。通过破坏结构对称性和时间反演对称性,可在同一拓扑陀螺超材料中打开的两个带隙附近都发现拓扑边界态的存在。将研究扩展到分析拓扑陀螺超材料的超胞,讨论了不同排列下两个新带隙中拓扑界面的波传播特性,揭示了拓扑陀螺超材料上下带隙拓扑边界态的方向性差异。此外,还证明了陀螺超材料拓扑边界态对缺陷的鲁棒性。

关键词: 陀螺声子晶体; 超材料; 狄拉克锥; 拓扑边界态; 波传播

Abstract: The research on gyroscopic metamaterials has pioneered a novel approach for topological acoustics. By incorporating gyroscopic structures into an infinitely periodic discrete medium with a concave hexagonal lattice, a gyroscopic phononic crystal (GPC) is proposed, with analysis focusing on the propagation of torsional waves with this structure. This work examines the bandgap characteristics of the gyroscopic phononic crystal, while exploring the mechanisms behind the opening of Dirac cones and the emergence of topological edge states induced by variations in gyroscopic torque. Subsequently, the influence of the gyroscopic rotation speed on the bandgap was studied in detail, and phenomena such as band inversion and Hall effect were discovered. It is shown that by breaking both structural symmetry and time-reversal symmetry, topological edge states can be identified near both of the opened bandgaps in the same topological gyroscopic metamaterial. The research is extended to analyze the unit cell of the topological gyroscopic metamaterial, discussing the wave propagation properties of topological interfaces within the two newly formed bandgaps under different configurations. This reveals directional disparities in the topological edge states between the upper and lower bandgaps of the topological gyroscopic metamaterial. Additionally, the robustness of these topological edge states against defects in the gyroscopic metamaterial is demonstrated.

Key words: gyroscopic phononic crystal; metamaterial; Dirac cone; topological edge state; wave propagation

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