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Observation of geometry-dependent skin effect in non-Hermitian phononic crystals with exceptional points

Author

Listed:
  • Qiuyan Zhou

    (Wuhan University)

  • Jien Wu

    (South China University of Technology)

  • Zhenhang Pu

    (Wuhan University)

  • Jiuyang Lu

    (Wuhan University
    South China University of Technology)

  • Xueqin Huang

    (South China University of Technology)

  • Weiyin Deng

    (Wuhan University
    South China University of Technology)

  • Manzhu Ke

    (Wuhan University)

  • Zhengyou Liu

    (Wuhan University
    Wuhan University)

Abstract

Exceptional points and skin effect, as the two distinct hallmark features unique to the non-Hermitian physics, have each attracted enormous interests. Recent theoretical works reveal that the topologically nontrivial exceptional points can guarantee the non-Hermitian skin effect, which is geometry-dependent, relating these two unique phenomena. However, such novel relation remains to be confirmed by experiments. Here, we realize a non-Hermitian phononic crystal with exceptional points, which exhibits the geometry-dependent skin effect. The exceptional points connected by the bulk Fermi arcs, and the skin effects with the geometry dependence, are evidenced in simulations and experiments. Our work, building an experimental bridge between the exceptional points and skin effect and uncovering the unconventional geometry-dependent skin effect, expands a horizon in non-Hermitian physics.

Suggested Citation

  • Qiuyan Zhou & Jien Wu & Zhenhang Pu & Jiuyang Lu & Xueqin Huang & Weiyin Deng & Manzhu Ke & Zhengyou Liu, 2023. "Observation of geometry-dependent skin effect in non-Hermitian phononic crystals with exceptional points," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-40236-7
    DOI: 10.1038/s41467-023-40236-7
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    References listed on IDEAS

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