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Acoustic non-Hermitian skin effect from twisted winding topology

Author

Listed:
  • Li Zhang

    (Zhejiang University
    Zhejiang University)

  • Yihao Yang

    (Zhejiang University
    Zhejiang University)

  • Yong Ge

    (Jiangsu University)

  • Yi-Jun Guan

    (Jiangsu University)

  • Qiaolu Chen

    (Zhejiang University
    Zhejiang University)

  • Qinghui Yan

    (Zhejiang University
    Zhejiang University)

  • Fujia Chen

    (Zhejiang University
    Zhejiang University)

  • Rui Xi

    (Zhejiang University
    Zhejiang University)

  • Yuanzhen Li

    (Zhejiang University
    Zhejiang University)

  • Ding Jia

    (Jiangsu University)

  • Shou-Qi Yuan

    (Jiangsu University)

  • Hong-Xiang Sun

    (Jiangsu University)

  • Hongsheng Chen

    (Zhejiang University
    Zhejiang University)

  • Baile Zhang

    (Nanyang Technological University
    Nanyang Technological University)

Abstract

The recently discovered non-Hermitian skin effect (NHSE) manifests the breakdown of current classification of topological phases in energy-nonconservative systems, and necessitates the introduction of non-Hermitian band topology. So far, all NHSE observations are based on one type of non-Hermitian band topology, in which the complex energy spectrum winds along a closed loop. As recently characterized along a synthetic dimension on a photonic platform, non-Hermitian band topology can exhibit almost arbitrary windings in momentum space, but their actual phenomena in real physical systems remain unclear. Here, we report the experimental realization of NHSE in a one-dimensional (1D) non-reciprocal acoustic crystal. With direct acoustic measurement, we demonstrate that a twisted winding, whose topology consists of two oppositely oriented loops in contact rather than a single loop, will dramatically change the NHSE, following previous predictions of unique features such as the bipolar localization and the Bloch point for a Bloch-wave-like extended state. This work reveals previously unnoticed features of NHSE, and provides the observation of physical phenomena originating from complex non-Hermitian winding topology.

Suggested Citation

  • Li Zhang & Yihao Yang & Yong Ge & Yi-Jun Guan & Qiaolu Chen & Qinghui Yan & Fujia Chen & Rui Xi & Yuanzhen Li & Ding Jia & Shou-Qi Yuan & Hong-Xiang Sun & Hongsheng Chen & Baile Zhang, 2021. "Acoustic non-Hermitian skin effect from twisted winding topology," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
  • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-26619-8
    DOI: 10.1038/s41467-021-26619-8
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    Citations

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    Cited by:

    1. Zhao-Xian Chen & Yu-Gui Peng & Ze-Guo Chen & Yuan Liu & Peng Chen & Xue-Feng Zhu & Yan-Qing Lu, 2024. "Robust temporal adiabatic passage with perfect frequency conversion between detuned acoustic cavities," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    2. Zhongming Gu & He Gao & Haoran Xue & Jensen Li & Zhongqing Su & Jie Zhu, 2022. "Transient non-Hermitian skin effect," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    3. 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.
    4. Zhen Li & Li-Wei Wang & Xulong Wang & Zhi-Kang Lin & Guancong Ma & Jian-Hua Jiang, 2024. "Observation of dynamic non-Hermitian skin effects," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    5. Federico Roccati & Miguel Bello & Zongping Gong & Masahito Ueda & Francesco Ciccarello & Aurélia Chenu & Angelo Carollo, 2024. "Hermitian and non-Hermitian topology from photon-mediated interactions," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    6. Xiao Li & Yongyin Cao & Jack Ng, 2024. "Non-Hermitian non-equipartition theory for trapped particles," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    7. Xuewei Zhang & Chaohua Wu & Mou Yan & Ni Liu & Ziyu Wang & Gang Chen, 2024. "Observation of continuum Landau modes in non-Hermitian electric circuits," Nature Communications, Nature, vol. 15(1), pages 1-7, December.

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