Pseudospins and topological edge states for fundamental antisymmetric Lamb modes in snowflakelike phononic crystal slabs

The Journal of the Acoustical Society of America
Shao-Yong HuoHong-Bo Huang

Abstract

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 Γ 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.

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Citations

Aug 3, 2019·The Journal of the Acoustical Society of America·Romain FleuryAndrew N Norris
May 10, 2020·Physical Review Letters·Yafei RenQian Niu
Sep 18, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Hongbo HuangShaoyong Huo

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