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Topological node lines in mechanical metacrystals

Zhan Xiong, Hai-Xiao Wang, Hao Ge, Jinjie Shi, Jie Luo, Yun Lai, Ming-Hui Lu, and Jian-Hua Jiang
Phys. Rev. B 97, 180101(R) – Published 18 May 2018
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Abstract

Topological elastic waves have recently emerged as an exciting interdisciplinary field which is still mainly focused on low-dimensional systems. Here we propose phononic topological node lines emerging from three-dimensional mechanical metacrystals. The resultant ribbon- or drumhead-like phononic edge states exhibit unusual frequency stability against perturbations, which can be exploited for robust elastic wave trapping for various applications. Our design leads to symmetry-guaranteed phononic topological node lines which are protected by both nonsymmorphic crystalline symmetry and fundamental conservation laws. The band topology, characterized by the nontrivial Zak phase, is also revealed through the reflection phase of the band gap.

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  • Received 4 December 2017
  • Revised 24 March 2018

DOI:https://doi.org/10.1103/PhysRevB.97.180101

©2018 American Physical Society

Physics Subject Headings (PhySH)

Interdisciplinary PhysicsNonlinear Dynamics

Authors & Affiliations

Zhan Xiong1, Hai-Xiao Wang1, Hao Ge2, Jinjie Shi1, Jie Luo1, Yun Lai1, Ming-Hui Lu2,*, and Jian-Hua Jiang1,†

  • 1College of Physics, Optoelectronics and Energy, & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 1 Shizi Street, Suzhou 215006, China
  • 2National Laboratory of Solid State Microstructures, & Department of Materials Science and Engineering, Nanjing University, Nanjing, Jiangsu 210093, China

  • *luminghui@nju.edu.cn
  • jianhuajiang@suda.edu.cn, joejhjiang@hotmail.com

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Issue

Vol. 97, Iss. 18 — 1 May 2018

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