期刊
PHYSICAL REVIEW B
卷 97, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.97.195307
关键词
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资金
- National Key Research Program of China [2016YFA0301101]
- National Natural Science Foundation of China (NSFC) [11504236, 11674247, 11775159, 11474220]
- Natural Science Foundation of Shanghai [17ZR1443800, 18ZR1442900, 18ZR1442800]
- National Youth 1000 Talents Program in China
- Fundamental Research Funds for the Central Universities
The Zak phase, which refers to Berry's phase picked up by a particle moving across the Brillouin zone, characterizes the topological properties of Bloch bands in a one-dimensional periodic system. Here the Zak phase in dimerized one-dimensional locally resonant metamaterials is investigated. It is found that there are some singular points in the bulk band across which the Bloch states contribute p to the Zak phase, whereas in the rest of the band the contribution is nearly zero. These singular points associated with zero reflection are caused by two differentmechanisms: the dimerization-independent antiresonance of each branch and the dimerization-dependent destructive interference in multiple backscattering. The structure undergoes a topological phase-transition point in the band structure where the band inverts, and the Zak phase, which is determined by the numbers of singular points in the bulk band, changes following a shift in dimerization parameter. Finally, the interface state between two dimerized metamaterial structures with different topological properties in the first band gap is demonstrated experimentally. The quasi-one-dimensional configuration of the system allows one to explore topology-inspired new methods and applications on the subwavelength scale.
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