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28 May 2022
 
  » arxiv » 1905.9731

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Edge states and corner modes in second-order topological phononic crystal plates
Shao-yong Huo ; Hong-bo Huang ; Lu-yang Feng ; Jiu-jiu Chen ;
Date 21 May 2019
AbstractWe realize an elastic second-order topological insulator hosting both one-dimensional gapped edge states and zero-dimensional in-gap corner modes in the double-sided pillared phononic crystal plates with square lattice. Changing the width of two neighbor pillars breaks the inversion symmetry and induces the band inversion to emulate the quantum spin Hall effect where the gapless edge states are obtained. Further breaking the space-symmetry at interface, the gapless edge states are gapped and inducing the edge topological transitions and then giving rise to the zero-dimensional in-gap corner modes. Our work offers a novel way for elastic wave trapping and robustly guiding.
Source arXiv, 1905.9731
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