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

Author

Listed:
  • Qianlong Kang

    (Hefei University of Technology)

  • Fujia Chen

    (Hefei University of Technology)

  • Hongyong Mao

    (Hefei University of Technology)

  • Keya Zhou

    (Harbin Institute of Technology)

  • Kai Guo

    (Hefei University of Technology)

  • Shutian Liu

    (Harbin Institute of Technology)

  • Zhongyi Guo

    (Hefei University of Technology)

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

Suggested Citation

  • Qianlong Kang & Fujia Chen & Hongyong Mao & Keya Zhou & Kai Guo & Shutian Liu & Zhongyi Guo, 2023. "Dual-band valley-protected topological edge states in graphene-like phononic crystals with waveguide," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 96(3), pages 1-7, March.
    • Handle: RePEc:spr:eurphb:v:96:y:2023:i:3:d:10.1140_epjb_s10051-023-00503-4
    DOI: 10.1140/epjb/s10051-023-00503-4
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    References listed on IDEAS

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    1. Alexander B. Khanikaev & Romain Fleury & S. Hossein Mousavi & Andrea Alù, 2015. "Topologically robust sound propagation in an angular-momentum-biased graphene-like resonator lattice," Nature Communications, Nature, vol. 6(1), pages 1-7, November.
    2. Zhenhua Tian & Chen Shen & Junfei Li & Eric Reit & Hunter Bachman & Joshua E. S. Socolar & Steven A. Cummer & Tony Jun Huang, 2020. "Dispersion tuning and route reconfiguration of acoustic waves in valley topological phononic crystals," Nature Communications, Nature, vol. 11(1), pages 1-10, December.
    3. S. Hossein Mousavi & Alexander B. Khanikaev & Zheng Wang, 2015. "Topologically protected elastic waves in phononic metamaterials," Nature Communications, Nature, vol. 6(1), pages 1-7, December.
    4. Xin-Tao He & En-Tao Liang & Jia-Jun Yuan & Hao-Yang Qiu & Xiao-Dong Chen & Fu-Li Zhao & Jian-Wen Dong, 2019. "A silicon-on-insulator slab for topological valley transport," Nature Communications, Nature, vol. 10(1), pages 1-9, December.
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