Elastic pseudospin transport for integratable topological phononic circuits

Si-Yuan Yu, Cheng He, Zhen Wang, Fu-Kang Liu, Xiao-Chen Sun, Zheng Li, Hai-Zhou Lu, Ming-Hui Lu (), Xiao-Ping Liu () and Yan-Feng Chen ()
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Si-Yuan Yu: Nanjing University
Cheng He: Nanjing University
Zhen Wang: Nanjing University
Fu-Kang Liu: Nanjing University
Xiao-Chen Sun: Nanjing University
Zheng Li: Nanjing University
Hai-Zhou Lu: South University of Science and Technology of China
Ming-Hui Lu: Nanjing University
Xiao-Ping Liu: Nanjing University
Yan-Feng Chen: Nanjing University

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Precise control of solid-state elastic waves’ mode content and coherence is of great use nowadays in reinforcing mechanical energy harvesting/storage, nondestructive material testing, wave-matter interaction, high sensitivity sensing, and information processing, etc. Its efficacy is highly dependent on having elastic transmission channels with lower loss and higher degree of freedom. Here, we demonstrate experimentally an elastic analog of the quantum spin Hall effects in a monolithically scalable configuration, which opens up a route in manipulating elastic waves represented by elastic pseudospins with spin-momentum locking. Their unique features including robustness and negligible propagation loss may enhance elastic planar-integrated circuit-level and system-level performance. Our approach promotes topological materials that can interact with solid-state phonons in both static and time-dependent regimes. It thus can be immediately applied to multifarious chip-scale topological phononic devices, such as path-arbitrary elastic wave-guiding, elastic splitters and elastic resonators with high-quality factors.

Date: 2018
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DOI: 10.1038/s41467-018-05461-5

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