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Acoustic spin-1 Weyl semimetal

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Abstract

The study of topological semimetals hosting spin-1 Weyl points (WPs) beyond Dirac points and WPs has attracted a great deal of attention. However, a spin-1 Weyl semimetal that exclusively possesses spin-1 WPs in a clean frequency window without being shadowed by any other nodal points is yet to be discovered. This study reports a spin-1 Weyl semimetal in a phononic crystal. Its spin-1 WPs are touched by two linear dispersions and an additional flat band and carry monopole charges (−2,0,2) or (2,0,−2) for the three bands from the bottom to the top. They result in double Fermi arcs, which occur between the first and second bands, as well as between the second and third bands. Further robust propagation is observed against the multiple joints and topological negative refraction of the acoustic surface arc wave. The results of this study create the basis for the exploration of the unusual properties of spin-1 Weyl physics on a macroscopic scale.

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Author notes

  1. These authors contributed equally to this work.

Authors and Affiliations

  1. School of Physics and Optoelectronics, South China University of Technology, Guangzhou, 510640, China

    WeiYin Deng, XueQin Huang, JiuYang Lu, Feng Li & JiaHong Ma

  2. Key Laboratory of Artificial Micro- and Nanostructures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan, 430072, China

    ZhengYou Liu

  3. Key Laboratory of Weak Light Nonlinear Photonics of Ministry of Education, School of Physics, Nankai University, Tianjin, 300071, China

    ShuQi Chen

  4. Institute for Advanced Studies, Wuhan University, Wuhan, 430072, China

    ZhengYou Liu

Authors
  1. WeiYin Deng
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Corresponding authors

Correspondence to Feng Li, ShuQi Chen or ZhengYou Liu.

Additional information

This work was supported by the National Key Research and Development Program of China (Grant No. 2018FYA0305800), the National Natural Science Foundation of China (Grant Nos. 11890701, 11704128, 11774275, 11804101, 11974005, and 11974120), the Guangdong Innovative and Entrepreneurial Research Team Program (Grant No. 2016ZT06C594), the Guangdong Basic and Applied Basic Research Foundation (Grant No. 2019B151502012), and the Fundamental Research Funds for the Central Universities (Grant Nos. 2018MS93, 2019JQ07, and 2019ZD49).

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The supporting information is available online at phys.scichina.com and http://link.springer.com/journal/11433. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.

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Deng, W., Huang, X., Lu, J. et al. Acoustic spin-1 Weyl semimetal. Sci. China Phys. Mech. Astron. 63, 287032 (2020). https://doi.org/10.1007/s11433-020-1558-8

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