期刊
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
卷 146, 期 1, 页码 729-735出版社
ACOUSTICAL SOC AMER AMER INST PHYSICS
DOI: 10.1121/1.5114903
关键词
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资金
- National Science Foundation of China [11374093]
- Young Scholar fund - common university and college of the province in Hunan
The topological transport of Lamb wave in phononic crystal slabs provides a great potential in reinforcing nondestructive testing, high sensitivity sensing, and information processing. In this paper, the authors investigate the pseudospins edge states of fundamental antisymmetric Lamb waves in a snowflakelike phononic slab. Significantly, the fourfold Dirac degeneracy for antisymmetric Lamb mode is accidentally formed at the Gamma point with the critical angle of the snowflakelike holes, which does not require the folding of the lattices. Meanwhile, based on the rotating-scatterer mechanism, the mirror symmetry is broken and the topological multipole phase transitions are well induced during the gradual change of the scattering strength among the scatterers with the rotation angle. The topologically protected edge states and its unidirectional robust propagation are further demonstrated. The proposed topological phononic slabs will be a more hopeful option to apply in engineering practices. (C) 2019 Acoustical Society of America.
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