期刊
PHYSICAL REVIEW B
卷 95, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.95.094305
关键词
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资金
- National Basic Research Program of China [2012CB921504]
- NSFC [11674172, 11674175, 11574148, 11474162, 11274171]
- SRFDP [20130091130004]
- Postdoctoral Science Foundation funded project of China [2015M571730]
- Jiangsu Provincial NSF [BK20160018, BK20150562]
- Jiangsu Planned Projects for Postdoctoral Research Funds [1402033B]
Acoustic topological states support sound propagation along the boundary in a one-way direction with inherent robustness against defects and disorders, leading to the revolution of the manipulation on acoustic waves. A variety of acoustic topological states relying on circulating fluid, chiral coupling, or temporal modulation have been proposed theoretically. However, experimental demonstration has so far remained a significant challenge, due to the critical limitations such as structural complexity and high losses. Here, we experimentally demonstrate an acoustic anomalous Floquet topological insulator in a waveguide network. The acoustic gapless edge states can be found in the band gap when the waveguides are strongly coupled. The scheme features simple structure and high-energy throughput, leading to the experimental demonstration of efficient and robust topologically protected sound propagation along the boundary. The proposal may offer a unique, promising application for design of acoustic devices in acoustic guiding, switching, isolating, filtering, etc.
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