| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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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 |
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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.
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Received: 01 December 2020
Revised: 31 January 2021
Accepted manuscript online: 01 March 2021
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PACS:
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43.55.+p
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(Architectural acoustics)
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43.90.+v
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(Other topics in acoustics)
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02.40.Pc
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(General topology)
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| Fund: 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). |
Corresponding Authors:
Zhong-Yi Guo
E-mail: guozhongyi@hfut.edu.cn
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Cite this article:
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 2021 Chin. Phys. B 30 084302
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