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

Qianlong Kang, Fujia Chen, Hongyong Mao, Keya Zhou, Kai Guo (), Shutian Liu and Zhongyi Guo ()
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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

The European Physical Journal B: Condensed Matter and Complex Systems, 2023, vol. 96, issue 3, 1-7

Abstract: 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

Date: 2023
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DOI: 10.1140/epjb/s10051-023-00503-4

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