Broadband topological valley-projected edge-states transport in composite structure phononic crystal

doi:10.1088/1674-1056/abea89

中国物理B ›› 2021, Vol. 30 ›› Issue (8): 84302-084302.doi: 10.1088/1674-1056/abea89

Broadband topological valley-projected edge-states transport in composite structure phononic crystal

Hong-Yong Mao(毛鸿勇), Fu-Jia Chen(陈福家), Kai Guo(郭凯), and Zhong-Yi Guo(郭忠义)^†

School of Computer and Information, Hefei University of Technology, Hefei 230009, China

收稿日期:2020-12-01 修回日期:2021-01-31 接受日期:2021-03-01 出版日期:2021-07-16 发布日期:2021-07-23
通讯作者: Zhong-Yi Guo E-mail:guozhongyi@hfut.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 61775050) and the Fundamental Research Funds for the Central Universities, China (Grant No. PA2019GDZC0098).

Broadband topological valley-projected edge-states transport in composite structure phononic crystal

Hong-Yong Mao(毛鸿勇), Fu-Jia Chen(陈福家), Kai Guo(郭凯), and Zhong-Yi Guo(郭忠义)^†

School of Computer and Information, Hefei University of Technology, Hefei 230009, China

Received:2020-12-01 Revised:2021-01-31 Accepted:2021-03-01 Online:2021-07-16 Published:2021-07-23
Contact: Zhong-Yi Guo E-mail:guozhongyi@hfut.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 61775050) and the Fundamental Research Funds for the Central Universities, China (Grant No. PA2019GDZC0098).

摘要/Abstract

摘要： The topological valley transport, realized in phononic crystals, has aroused tremendous interest in these years. Many previous researches have further promoted the development of this transport phenomenon. Crucially, the bandwidth of the valley-projected edge mode has been an essential research topic. As is well known, the broadband will improve the adaptability of the acoustic edge-states, which will be more conducive to the transmission of information. Therefore, in this paper, we present a composite structure, composed of the atoms with different shapes forming a hexagonal lattice, which can achieve larger bandwidth than a single structure. Meanwhile, the results demonstrate that the topological protected edge states are also observed in our structure. Furthermore, the backscattering suppressions from associated valley-protected edge states under certain perturbations have also been investigated and demonstrated. Our work can provide a new idea for designing acoustic devices based on valley degree of freedom.

关键词: valley transport, composite structures, broadband edge-states

Abstract: The topological valley transport, realized in phononic crystals, has aroused tremendous interest in these years. Many previous researches have further promoted the development of this transport phenomenon. Crucially, the bandwidth of the valley-projected edge mode has been an essential research topic. As is well known, the broadband will improve the adaptability of the acoustic edge-states, which will be more conducive to the transmission of information. Therefore, in this paper, we present a composite structure, composed of the atoms with different shapes forming a hexagonal lattice, which can achieve larger bandwidth than a single structure. Meanwhile, the results demonstrate that the topological protected edge states are also observed in our structure. Furthermore, the backscattering suppressions from associated valley-protected edge states under certain perturbations have also been investigated and demonstrated. Our work can provide a new idea for designing acoustic devices based on valley degree of freedom.

Key words: valley transport, composite structures, broadband edge-states

中图分类号: (Architectural acoustics)

43.55.+p

43.90.+v (Other topics in acoustics) 02.40.Pc (General topology)

Hong-Yong Mao(毛鸿勇), Fu-Jia Chen(陈福家), Kai Guo(郭凯), and Zhong-Yi Guo(郭忠义). Broadband topological valley-projected edge-states transport in composite structure phononic crystal[J]. 中国物理B, 2021, 30(8): 84302-084302.

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Broadband topological valley-projected edge-states transport in composite structure phononic crystal

Broadband topological valley-projected edge-states transport in composite structure phononic crystal

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