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Acoustic realization of quadrupole topological insulators
- 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：否
- 发表时间：2020-05-18
