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Experimental realization of three-dimensional elastic phononic topological insulator | | Shao-yong Huo
; Jiu-jiu Chen Hong-bo Huang
; Yong-jian Wei
; Zhu-hua Tan Lu-yang Feng
; Xiao-ping Xie
; | | Date: |
13 Apr 2020 | | Abstract: | Three-dimensional (3D) elastic phononic topological insulator, featuring
two-dimensional (2D) surface states, which support the high-efficient and
robust elastic wave propagation without backscattering in all spatial
dimensions, remains a challenge due to the nature of multiple polarized elastic
modes and their complex hybridization in 3D. Here, a 3D elastic phononic
topological insulator is designed and observed experimentally by emulating the
quantum valley Hall effects. The spatial inversion of adjacent atoms gives rise
to a valley topological phase to an insulating regime with complete 3D
topological phononic bandgap. The 2D surface states protected by valley
topology are unveiled numerically, which are confirmed experimentally to have a
great robustness against the straight channel and sharp bends. Further
engineering the elastic valley layer with appropriate interlayer coupling, we
also demonstrate that layer pseudospin can be created in 3D elastic system
which leads to 2D topological layer-dependent surface states and
layer-selective transport. Our work will be a key step for the manipulation of
elastic wave in 2D topological plane and the applications of 3D elastic
topological-insulator-based devices with layer-selective functionality. | | Source: | arXiv, 2004.5743 | | Services: | Forum | Review | PDF | Favorites | |
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