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Three-dimensional flat Landau levels in an inhomogeneous acoustic crystal

Author

Listed:
  • Zheyu Cheng

    (Nanyang Technological University)

  • Yi-Jun Guan

    (Jiangsu University
    Chinese Academy of Sciences)

  • Haoran Xue

    (The Chinese University of Hong Kong)

  • Yong Ge

    (Jiangsu University)

  • Ding Jia

    (Jiangsu University)

  • Yang Long

    (Nanyang Technological University)

  • Shou-Qi Yuan

    (Jiangsu University)

  • Hong-Xiang Sun

    (Jiangsu University
    Chinese Academy of Sciences)

  • Yidong Chong

    (Nanyang Technological University
    Nanyang Technological University)

  • Baile Zhang

    (Nanyang Technological University
    Nanyang Technological University)

Abstract

When electrons moving in two dimensions (2D) are subjected to a strong uniform magnetic field, they form flat bands called Landau levels (LLs). LLs can also arise from pseudomagnetic fields (PMFs) induced by lattice distortions. In three-dimensional (3D) systems, there has been no experimental demonstration of LLs as a type of flat band thus far. Here, we report the experimental realization of a flat 3D LL in an acoustic crystal. Starting from a lattice whose bandstructure exhibits a nodal ring, we design an inhomogeneous distortion corresponding to a specific pseudomagnetic vector potential (PVP). This distortion causes the nodal ring states to break up into LLs, including a zeroth LL that is flat along all three directions. These findings suggest the possibility of using nodal ring materials to generate 3D flat bands, allowing access to strong interactions and other attractive physical regimes in 3D.

Suggested Citation

  • Zheyu Cheng & Yi-Jun Guan & Haoran Xue & Yong Ge & Ding Jia & Yang Long & Shou-Qi Yuan & Hong-Xiang Sun & Yidong Chong & Baile Zhang, 2024. "Three-dimensional flat Landau levels in an inhomogeneous acoustic crystal," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-46517-z
    DOI: 10.1038/s41467-024-46517-z
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    References listed on IDEAS

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