期刊
PHYSICAL REVIEW B
卷 99, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.99.224104
关键词
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资金
- National Key R&D Program of China [2017YFA0303702]
- NSFC [11834008, 11874215, 11674172, 11574148]
- Jiangsu Provincial NSF [BK20160018]
- Fundamental Research Funds for the Central Universities [020414380001]
- Nanjing University Innovation and Creative Program for PhD candidate [CXCY17-11]
- China Scholarship Council
- European Research Council (ERC) [714577 PHONOMETA]
- MINECO through a Ramon y Cajal grant [RYC-2015-17156]
Acoustic analogies of topological insulators reside at the frontier of ongoing metamaterials research. Of particular interest are the topological interface states that are determined by the Zak phase, which is the geometric phase characterizing the topological property of the bands in one-dimensional systems. Here we design double-channel Mie resonators based on the so-called labyrinth acoustic metamaterials, which can be considered equivalent to a ultraslow medium of large refractive index, inevitably containing structural features on a subwavelength scale. The metamolecule containing two cells is engineered to host the degenerated states through a zone-folding mechanism, whereupon the Zak phase transition takes place when the interval between two cells changes from shrunk to expanded. Furthermore, the topological interface state displays strong robustness against randomly introduced perturbations whose acoustic intensity is enhanced by nearly a factor 1600 in comparison to an ordinary waveguide.
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