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Title: Acoustic valley edge states in a graphene-like resonator system
Authors: Yang, Yahui
Yang, Zhaoju
Zhang, Baile
Keywords: Graphene
Acoustic Waves
Issue Date: 2018
Source: Yang, Y., Yang, Z., & Zhang, B. (2018). Acoustic valley edge states in a graphene-like resonator system. Journal of Applied Physics, 123(9), 091713-. doi:10.1063/1.5009626
Series/Report no.: Journal of Applied Physics
Abstract: The concept of valley physics, as inspired by the recent development in valleytronic materials, has been extended to acoustic crystals for manipulation of air-borne sound. Many valleytronic materials follow the model of a gapped graphene. Yet the previously demonstrated valley acoustic crystal adopted a mirror-symmetry-breaking mechanism, lacking a direct counterpart in condensed matter systems. In this paper, we investigate a two-dimensional (2D) periodic acoustic resonator system with inversion symmetry breaking, as an analogue of a gapped graphene monolayer. It demonstrates the quantum valley Hall topological phase for sound waves. Similar to a gapped graphene, gapless topological valley edge states can be found at a zigzag domain wall separating different domains with opposite valley Chern numbers, while an armchair domain wall hosts no gapless edge states. Our study offers a route to simulate novel valley phenomena predicted in gapped graphene and other 2D materials with classical acoustic waves.
ISSN: 0021-8979
DOI: 10.1063/1.5009626
Rights: © 2018 The Author(s). All rights reserved. This paper was published by AIP in Journal of Applied Physics and is made available with permission of The Author(s).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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