Topological pseudospin switcher:Mechanism and acoustic realization  

作　　者：Jia-He Chen Yiyin Chen Yaoqieyu Song Yongxu Xu Xinrong Li Jingsong Wang Jiawei He Jiaxu Qu Zheng Li Xiaofei Li Wenqiang Lin Jiannan Chen Caixing Fu Zhi Hong Hang 

机构地区：[1]School of Physical Science and Technology&Collaborative Innovation Center of Suzhou Nano Science and Technology,Soochow University,Suzhou 215006,China [2]Institute for Advanced Study,Soochow University,Suzhou 215006,China [3]Provincial Key Lab of Thin Films,Soochow University,Suzhou 215006,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2024年第5期46-53,共8页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Key R&D Program of China(Grant No.2022YFA1404400);the National Natural Science Foundation of China(Grant No.12274315);a Project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD);the Postgraduate Research and Practice Innovation Program of Jiangsu Province(Grant No.KYCX23_3228)。

摘　　要：The control of the pseudospin of sound wave has attracted increasing attention in recent years.Utilizing the finite-size effect of topological acoustics,we successfully construct an H-shaped acoustic topological pseudospin switcher that sound wave energy can be easily switched through different passages.The interesting phenomenon of pseudospin flipping is numerically and experimentally demonstrated.A quantitative interference theory is proposed that the constructive and destructive interference of pseudospin states leads to pseudospin flipping and preserving in multiple frequencies.We verify the key parameters of the design,including the length of the passage and its interface state dispersion,and the theory can be extended to other topology acoustics and photonics systems.Moreover,the tunable topological sonic crystal we use provides adjustable convenience to pseudospin switcher design.The pseudospin switching behavior offers an efficient method to control the acoustic topological edge state transport,which has great potential in versatile applications,such as integrated acoustics,acoustic security,and information processing.

关 键 词：TOPOLOGICAL ACOUSTICS REALIZATION 

分 类 号：O42[理学—声学]