Twisted pillared phononic crystal plates

Recent discoveries in twisted heterostructure materials have opened research directions in classical wave systems. This Letter investigates a family of double-sided pillared phononic crystal plates as the elastodynamic analog of bilayer graphene, including twisted bilayer graphene. The phononic crystal plate design is first validated by studying the basic AA- and AB-stack configurations under weak interlayer coupling. A specific commensurate twist angle giving rise to the sublattice exchange even symmetry is then studied to examine the twist-modulated band structure. Finally, this study demonstrates that the same twist angle, in concert with an ultra-strong interlayer coupling, can collectively create valley-dependent edge states that have not been previously observed in electronic bilayer graphene.

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in [Twisted pillared phononic crystal plates. Applied Physics Letters 120, 23 (2022)] and may be found at https://doi.org/10.1063/5.0097082.

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Work Title Twisted pillared phononic crystal plates
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Open Access
Creators
  1. Mourad Oudich
  2. Yuanchen Deng
  3. Yun Jing
License In Copyright (Rights Reserved)
Work Type Article
Publisher
  1. Applied Physics Letters
Publication Date June 6, 2022
Publisher Identifier (DOI)
  1. https://doi.org/10.1063/5.0097082
Deposited December 14, 2024

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