Journal
APPLIED PHYSICS LETTERS
Volume 110, Issue 17, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4982620
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Funding
- National Natural Science Foundation of China [11674119, 11690030, 11690032, 11404125]
- Bird Nest Plan of HUST
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Anomalous Floquet topological insulators (AFIs) for airborne sound have recently been realized in experiments. However, the implemented version suffers from significant loss and narrowband due to thermal viscosity and dispersive coupling strength between unit-cells. Here, we propose a solution for realizing low-loss and broadband acoustic AFI. We show that the loss after passing through one unit-cell can be less than 2% for the topological edge states. It is also theoretically unveiled that in the frequency range of nearly unitary coupling (similar to 0.97 from 4.8 kHz to 7.0 kHz in our case), around 84% corresponds to topological bands. Our proposal may promote the application of large-dimension acoustic topological devices. Published by AIP Publishing.
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