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Acoustic realization of quadrupole topological insulators

  • 发布时间:2020-05-16
  • 点击次数:
  • 发表刊物:Physical Review Letters
  • 摘要:A quadrupole topological insulator, being one higher-order topological insulator with nontrivial quadrupole quantization, has been intensely investigated very recently. However, the tight-binding model proposed for such emergent topological insulators demands both positive and negative hopping coefficients, which imposes an obstacle in practical realizations. Here we introduce a feasible approach to design the sign of hopping in acoustics, and construct the first acoustic quadrupole topological insulator that stringently emulates the tight-binding model. The inherent hierarchy quadrupole …
  • 卷号:124
  • 期号:20
  • 页面范围:206601
  • 是否译文:
  • 发表时间:2020

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