气候变化领域集成服务门户(CCPortal): Experimental realization of a reconfigurable electroacoustic topological insulator

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DOI	10.1073/pnas.1920549117
	Experimental realization of a reconfigurable electroacoustic topological insulator
	Darabi A.; Collet M.; Leamy M.J.
发表日期	2020
ISSN	0027-8424
起始页码	16138
结束页码	16142
卷号	117 期号:28
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.
英文关键词	Electroacoustic; Metamaterial; Piezoelectric; Topological insulators
语种	英语
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
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160261
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
推荐引用方式 GB/T 7714	Darabi A.,Collet M.,Leamy M.J.. Experimental realization of a reconfigurable electroacoustic topological insulator[J],2020,117(28).
APA	Darabi A.,Collet M.,&Leamy M.J..(2020).Experimental realization of a reconfigurable electroacoustic topological insulator.Proceedings of the National Academy of Sciences of the United States of America,117(28).
MLA	Darabi A.,et al."Experimental realization of a reconfigurable electroacoustic topological insulator".Proceedings of the National Academy of Sciences of the United States of America 117.28(2020).