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<p>The concept of valley pseudospin, which is associated with energy peaks at specific momentum locations, has garnered significant attention in recent research as an effective means of controlling classical waves. In this paper, we investigate composite acoustic topological metamaterials composed of hollow tubes (HTs) and opened-hole hollow tubes (OHTs) arranged in a honeycomb pattern with C<sub>3v</sub> symmetry. By adjusting the rotation angle of the systems, we obtain a degenerate Dirac point for structure B and band inversions for structures A and C within two bands. We have engineered an A|B|C configuration to confine topological valley-locked waveguide states (TVWSs) within the B region composed of <i>x</i> layers, targeting two discrete frequency bands centered at 5820&#xa0;Hz and 5280&#xa0;Hz. In this configuration, the dual-band TVWSs can be tuned by geometry sizes of meta-atoms HTs and meta-molecules OHTs. These dual-band states incorporate both gapless dispersion, valley-locked unidirectional transport, and defect immunity, while demonstrating high-efficiency energy transmission. Our findings could facilitate the realization of broadband TVWSs and hold significant promise for acoustic wave manipulation applications, including wave splitting, reflection-free guiding, and acoustic wave focusing.</p>

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Dual-band valley-locked waveguide transport in acoustic heterostructures

  • 期刊论文

  • 发表日期：

    2026年1月21日

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  • Changlin Ding,
  • Yang Sun,
  • Muchun Di,
  • Xiaotian Zhang,
  • Zhiliang Gong,
  • Shilong Zhai,
  • Xiaopeng Zhao

摘要

The concept of valley pseudospin, which is associated with energy peaks at specific momentum locations, has garnered significant attention in recent research as an effective means of controlling classical waves. In this paper, we investigate composite acoustic topological metamaterials composed of hollow tubes (HTs) and opened-hole hollow tubes (OHTs) arranged in a honeycomb pattern with C3v symmetry. By adjusting the rotation angle of the systems, we obtain a degenerate Dirac point for structure B and band inversions for structures A and C within two bands. We have engineered an A|B|C configuration to confine topological valley-locked waveguide states (TVWSs) within the B region composed of x layers, targeting two discrete frequency bands centered at 5820 Hz and 5280 Hz. In this configuration, the dual-band TVWSs can be tuned by geometry sizes of meta-atoms HTs and meta-molecules OHTs. These dual-band states incorporate both gapless dispersion, valley-locked unidirectional transport, and defect immunity, while demonstrating high-efficiency energy transmission. Our findings could facilitate the realization of broadband TVWSs and hold significant promise for acoustic wave manipulation applications, including wave splitting, reflection-free guiding, and acoustic wave focusing.