Twisted pillared phononic crystal plates

Mourad Oudich; Yuanchen Deng; Yun Jing

doi:10.1063/5.0097082

Twisted pillared phononic crystal plates

Mourad Oudich, Yuanchen Deng, Yun Jing

Graduate Program in Acoustics

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

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.

Original language	English (US)
Article number	232202
Journal	Applied Physics Letters
Volume	120
Issue number	23
DOIs	https://doi.org/10.1063/5.0097082
State	Published - Jun 6 2022

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/5.0097082

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title = "Twisted pillared phononic crystal plates",

abstract = "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.",

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AB - 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.

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Twisted pillared phononic crystal plates

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