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Experimental demonstration of anomalous Floquet topological insulator for sound

Author

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  • Yu-Gui Peng

    (School of Physics, Huazhong University of Science and Technology
    Innovation Institute, Huazhong University of Science and Technology)

  • Cheng-Zhi Qin

    (School of Physics, Huazhong University of Science and Technology)

  • De-Gang Zhao

    (School of Physics, Huazhong University of Science and Technology)

  • Ya-Xi Shen

    (School of Physics, Huazhong University of Science and Technology)

  • Xiang-Yuan Xu

    (Key Laboratory of Noise and Vibration Research, Institute of Acoustics, Chinese Academy of Sciences
    School of Automation, Wuhan University of Technology)

  • Ming Bao

    (Key Laboratory of Noise and Vibration Research, Institute of Acoustics, Chinese Academy of Sciences)

  • Han Jia

    (Key Laboratory of Noise and Vibration Research, Institute of Acoustics, Chinese Academy of Sciences)

  • Xue-Feng Zhu

    (School of Physics, Huazhong University of Science and Technology
    Innovation Institute, Huazhong University of Science and Technology)

Abstract

Time-reversal invariant topological insulator is widely recognized as one of the fundamental discoveries in condensed matter physics, for which the most fascinating hallmark is perhaps a spin-based topological protection, the absence of scattering of conduction electrons with certain spins on matter surface. Recently, it has created a paradigm shift for topological insulators, from electronics to photonics, phononics and mechanics as well, bringing about not only involved new physics but also potential applications in robust wave transport. Despite the growing interests in topologically protected acoustic wave transport, T-invariant acoustic topological insulator has not yet been achieved. Here we report experimental demonstration of anomalous Floquet topological insulator for sound: a strongly coupled metamaterial ring lattice that supports one-way propagation of pseudo-spin-dependent edge states under T-symmetry. We also demonstrate the formation of pseudo-spin-dependent interface states due to lattice dislocations and investigate the properties of pass band and band gap states.

Suggested Citation

  • Yu-Gui Peng & Cheng-Zhi Qin & De-Gang Zhao & Ya-Xi Shen & Xiang-Yuan Xu & Ming Bao & Han Jia & Xue-Feng Zhu, 2016. "Experimental demonstration of anomalous Floquet topological insulator for sound," Nature Communications, Nature, vol. 7(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13368
    DOI: 10.1038/ncomms13368
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    Cited by:

    1. Xiao-Chen Sun & Hao Chen & Hua-Shan Lai & Chu-Hao Xia & Cheng He & Yan-Feng Chen, 2023. "Ideal acoustic quantum spin Hall phase in a multi-topology platform," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    2. Ren, Boquan & Kartashov, Yaroslav V. & Wang, Hongguang & Li, Yongdong & Zhang, Yiqi, 2023. "Floquet topological insulators with hybrid edges," Chaos, Solitons & Fractals, Elsevier, vol. 166(C).
    3. Feng Gao & Xiao Xiang & Yu-Gui Peng & Xiang Ni & Qi-Li Sun & Simon Yves & Xue-Feng Zhu & Andrea Alù, 2023. "Orbital topological edge states and phase transitions in one-dimensional acoustic resonator chains," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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