DOI: 10.1073/pnas.1920549117
论文题名: Experimental realization of a reconfigurable electroacoustic topological insulator
作者: Darabi A. ; Collet M. ; Leamy M.J.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期: 28 起始页码: 16138
结束页码: 16142
语种: 英语
英文关键词: Electroacoustic
; Metamaterial
; Piezoelectric
; Topological insulators
Scopus关键词: acid
; graphene
; polyactic acid
; unclassified drug
; acoustics
; Article
; chemical bond
; dynamics
; electric capacitance
; electricity
; experimental study
; mathematical analysis
; morphology
; phonon
; piezoelectricity
; priority journal
; structure analysis
; topological insulator
; validation study
英文摘要: A substantial challenge in guiding elastic waves is the presence of reflection and scattering at sharp edges, defects, and disorder. Recently, mechanical topological insulators have sought to overcome this challenge by supporting back-scattering resistant wave transmission. In this paper, we propose and experimentally demonstrate a reconfigurable electroacoustic topological insulator exhibiting an analog to the quantum valley Hall effect (QVHE). Using programmable switches, this phononic structure allows for rapid reconfiguration of domain walls and thus the ability to control back-scattering resistant wave propagation along dynamic interfaces for phonons lying in static and finite-frequency regimes. Accordingly, a graphene-like polyactic acid (PLA) layer serves as the host medium, equipped with periodically arranged and bonded piezoelectric (PZT) patches, resulting in two Dirac cones at the K points. The PZT patches are then connected to negative capacitance external circuits to break inversion symmetry and create nontrivial topologically protected bandgaps. As such, topologically protected interface waves are demonstrated numerically and validated experimentally for different predefined trajectories over a broad frequency range. © 2020 National Academy of Sciences. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163435
Appears in Collections: 气候变化与战略
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作者单位: Darabi, A., Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30318, United States; Collet, M., Laboratory of Tribology and System Dynamics, UMR CNRS 5513, Ecole Centrale de Lyon, Ecully, 69134, France; Leamy, M.J., Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30318, United States
Recommended Citation:
Darabi A.,Collet M.,Leamy M.J.. Experimental realization of a reconfigurable electroacoustic topological insulator[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(28)