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Experimental realization of on-chip topological nanoelectromechanical metamaterials

Cha, Jinwoong and Kim, Kun Woo and Daraio, Chiara (2018) Experimental realization of on-chip topological nanoelectromechanical metamaterials. Nature, 564 (7735). pp. 229-233. ISSN 0028-0836. http://resolver.caltech.edu/CaltechAUTHORS:20180817-140020696

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[img] Video (MPEG) (Video 2: Time evolution of the plate vibrational mode at point 2 in Figure 2f) - Supplemental Material
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[img] Video (MPEG) (Video 3: Time evolution of the plate vibrational mode at point 3 in Figure 2f) - Supplemental Material
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[img] Video (MPEG) (Video 4: Time evolution of the plate vibrational mode at point 4 in Figure 2f) - Supplemental Material
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[img] Image (JPEG) (Extended Data Fig. 1: Fabrication) - Supplemental Material
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[img] Image (JPEG) (Extended Data Fig. 2: Unit cell structures for the different topological phases) - Supplemental Material
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[img] Image (JPEG) (Extended Data Fig. 3: Experimental characterization of the straight topological edge waveguide) - Supplemental Material
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[img] Image (JPEG) (Extended Data Fig. 4: Characteristics of the defect mode) - Supplemental Material
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[img] Image (JPEG) (Extended Data Fig. 5: Characteristics of the distorted waveguide) - Supplemental Material
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[img] Image (JPEG) (Extended Data Fig. 6: Frequency responses of the NEMM with the pseudospin filter configuration) - Supplemental Material
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Abstract

Guiding waves through a stable physical channel is essential for reliable information transport. However, energy transport in high-frequency mechanical systems, such as in signal-processing applications, is particularly sensitive to defects and sharp turns because of back-scattering and losses. Topological phenomena in condensed matter systems have shown immunity to defects and unidirectional energy propagation. Topological mechanical metamaterials translate these properties into classical systems for efficient phononic energy transport. Acoustic and mechanical topological metamaterials have so far been realized only in large-scale systems, such as arrays of pendulums, gyroscopic lattices, structured plates and arrays of rods, cans and other structures acting as acoustic scatterers9. To fulfil their potential in device applications, mechanical topological systems need to be scaled to the on-chip level for high-frequency transport. Here we report the experimental realization of topological nanoelectromechanical metamaterials, consisting of two-dimensional arrays of free-standing silicon nitride nanomembranes that operate at high frequencies (10–20 megahertz). We experimentally demonstrate the presence of edge states, and characterize their localization and Dirac-cone-like frequency dispersion. Our topological waveguides are also robust to waveguide distortions and pseudospin-dependent transport. The on-chip integrated acoustic components realized here could be used in unidirectional waveguides and compact delay lines for high-frequency signal-processing applications.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1038/s41586-018-0764-0DOIArticle
https://rdcu.be/bdeEgPublisherFree ReadCube access
https://arxiv.org/abs/1806.10680arXivDiscussion Paper
ORCID:
AuthorORCID
Daraio, Chiara0000-0001-5296-4440
Additional Information:© 2018 Springer Nature Limited. Received 26 June 2018; Accepted 07 October 2018; Published 12 December 2018. J.C. and C.D. acknowledge partial support for this project from NSF EFRI award number 1741565, and the Kavli Nanoscience Institute at Caltech. K.W.K. acknowledges support for this project from the “Overseas Research Program for Young Scientists” programme through the Korea Institute for Advanced Study (KIAS). Data availability: The data that support the findings of this study are available from the corresponding author upon reasonable request. Author Contributions: J.C. and C.D. conceived the idea of the research. J.C. designed and fabricated the samples, built the experimental setups and performed the measurements. J.C. also performed all numerical simulations. J.C. and K.W.K. performed the theoretical studies. J.C., K.W.K. and C.D. analysed the data and wrote the manuscript. The authors declare no competing interests.
Group:Kavli Nanoscience Institute
Funders:
Funding AgencyGrant Number
NSFEFRI-1741565
Kavli Nanoscience InstituteUNSPECIFIED
Korea Institute for Advanced StudyUNSPECIFIED
Record Number:CaltechAUTHORS:20180817-140020696
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180817-140020696
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88934
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:17 Aug 2018 21:42
Last Modified:12 Dec 2018 18:39

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