Observation of elastic topological states in soft materials

Shuaifeng Li, Degang Zhao, Hao Niu, Xuefeng Zhu and Jianfeng Zang ()
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Shuaifeng Li: Huazhong University of Science and Technology
Degang Zhao: Huazhong University of Science and Technology
Hao Niu: Huazhong University of Science and Technology
Xuefeng Zhu: Huazhong University of Science and Technology
Jianfeng Zang: Huazhong University of Science and Technology

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract Topological elastic metamaterials offer insight into classic motion law and open up opportunities in quantum and classic information processing. Theoretical modeling and numerical simulation of elastic topological states have been reported, whereas the experimental observation remains relatively unexplored. Here we present an experimental observation and numerical simulation of tunable topological states in soft elastic metamaterials. The on-demand reversible switch in topological phase has been achieved by changing filling ratio, tension, and/or compression of the elastic metamaterials. By combining two elastic metamaterials with distinct topological invariants, we further demonstrate the formation and dynamic tunability of topological interface states by mechanical deformation, and the manipulation of elastic wave propagation. Moreover, we provide a topological phase diagram of elastic metamaterials under deformation. Our approach to dynamically control interface states in soft materials paves the way to various phononic systems involving thermal management and soft robotics requiring better use of energy.

Date: 2018
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DOI: 10.1038/s41467-018-03830-8

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