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Dual-band valley-protected topological edge states in graphene-like phononic crystals with waveguide

  • Regular Article - Solid State and Materials
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Abstract

Since valley was introduced into phononic crystals, it has promoted far-reaching developments in topologically protected acoustic transmission. However, in the novel research field of valley-Hall phononic topological insulators, most researchers only focus on valley-protected edge state with a single working frequency band. Here, we demonstrate dual-band valley-protected topological edge states in a graphene-like two-dimensional phononic crystal, which consists of columnar air cavities and rigid scatters. It is demonstrated that energy band inversion happens and a gap can be opened at the two Dirac cones at the K (K') symmetry points of the Brillouin zone by tuning the radius differences between adjacent columnar air cavities. In addition, we demonstrate the presence of dual-band topologically protected edge states with properties like suppressed back-scattering, one-way transmission, and sharp bend resistance. In these contexts, beam splitting with dual-band is achieved by combining valley vortex states with opposite chirality. Our work may provide a practical method for solving high-efficiency and high-capacity multi-channel acoustic communication in fluid media.

Graphical Abstract

The dual-band valley-protected topological edge states have been demonstrated in a graphenelike two-dimensional phononic crystal, which consists of columnar air cavities and rigid scatters. The energy band inversion happens and a gap can be opened at the two Dirac cones at the K (K’) symmetry points of the Brillouin zone by tuning the radius differences between adjacent columnar air cavities. Based on these, beam splitting with dual-band can be achieved by combining valley vortex states with opposite chirality

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Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Funding

National Natural Science Foundation of China (61775050, 11804073).

Author information

Authors and Affiliations

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

    Qianlong Kang, Fujia Chen, Hongyong Mao, Kai Guo & Zhongyi Guo

  2. School of Physics, Harbin Institute of Technology, Harbin, 150001, China

    Keya Zhou & Shutian Liu

Authors
  1. Qianlong Kang
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  2. Fujia Chen
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Contributions

Conceptualization: Qianlong kang, Hongyong mao; Methodology: Qianlong kang, Fujia Chen, Hongyong mao; Formal analysis and investigation: Keya Zhou, Kai Guo, Shutian Liu, Zhongyi Guo; Writing—original draft preparation: Qianlong kang; Writing—review and editing: Keya Zhou, Kai Guo, Shutian Liu, Zhongyi Guo; Funding acquisition: Zhongyi Guo; Supervision: Zhongyi Guo.

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Correspondence to Zhongyi Guo.

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Kang, Q., Chen, F., Mao, H. et al. Dual-band valley-protected topological edge states in graphene-like phononic crystals with waveguide. Eur. Phys. J. B 96, 40 (2023). https://doi.org/10.1140/epjb/s10051-023-00503-4

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