Discovering topological surface states of Dirac points in an acoustic crystal

ORAL

Abstract

Dirac materials, unlike the Weyl materials, have not been found in experiments to support intrinsic topological surface states, as the surface arcs in existing systems are unstable against symmetry-preserving perturbations. Utilizing the proposed glide and time-reversal symmetries, we theoretically design and experimentally verify an acoustic crystal of two frequency-isolated three-dimensional Dirac points with Z2 monopole charges and four gapless helicoid surface sheets. Under symmetry breakings, the 3D ideal Dirac point breaks into Z2 Weyl dipoles, Z2 nodal rings or a full bandgap.

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Presenters

  • hengbin cheng

    • Institute of Physics, Chinese Academy of Sciences/Beijing National Laboratory for Condensed Matter Physics, Beijing, China

Authors

  • hengbin cheng

    • Institute of Physics, Chinese Academy of Sciences/Beijing National Laboratory for Condensed Matter Physics, Beijing, China

  • Yixin Sha

    • School of Electronics Engineering and Computer Science, Peking University, Beijing, China

  • Rongjuan Liu

    • Institute of Physics, Chinese Academy of Sciences/Beijing National Laboratory for Condensed Matter Physics, Beijing, China

  • Chen Fang

    • Chinese academy of sciences
    • Institute of Physics, Chinese Academy of Sciences/Beijing National Laboratory for Condensed Matter Physics, Beijing, China
    • Chinese Academy of Sciences,Institute of Physics
    • Institute of Physics, Chinese Academy of Science
    • Beijing National Research Center for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences

  • Ling Lu

    • Chinese academy of sciences
    • Institute of Physics, Chinese Academy of Sciences/Beijing National Laboratory for Condensed Matter Physics, Beijing, China