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Observation of non-Hermitian topological Anderson insulator in quantum dynamics

Author

Listed:
  • Quan Lin

    (Beijing Computational Science Research Center)

  • Tianyu Li

    (University of Science and Technology of China
    CAS Center For Excellence in Quantum Information and Quantum Physics)

  • Lei Xiao

    (Beijing Computational Science Research Center)

  • Kunkun Wang

    (Beijing Computational Science Research Center)

  • Wei Yi

    (University of Science and Technology of China
    CAS Center For Excellence in Quantum Information and Quantum Physics)

  • Peng Xue

    (Beijing Computational Science Research Center)

Abstract

Disorder and non-Hermiticity dramatically impact the topological and localization properties of a quantum system, giving rise to intriguing quantum states of matter. The rich interplay of disorder, non-Hermiticity, and topology is epitomized by the recently proposed non-Hermitian topological Anderson insulator that hosts a plethora of exotic phenomena. Here we experimentally simulate the non-Hermitian topological Anderson insulator using disordered photonic quantum walks, and characterize its localization and topological properties. In particular, we focus on the competition between Anderson localization induced by random disorder, and the non-Hermitian skin effect under which all eigenstates are squeezed toward the boundary. The two distinct localization mechanisms prompt a non-monotonous change in profile of the Lyapunov exponent, which we experimentally reveal through dynamic observables. We then probe the disorder-induced topological phase transitions, and demonstrate their biorthogonal criticality. Our experiment further advances the frontier of synthetic topology in open systems.

Suggested Citation

  • Quan Lin & Tianyu Li & Lei Xiao & Kunkun Wang & Wei Yi & Peng Xue, 2022. "Observation of non-Hermitian topological Anderson insulator in quantum dynamics," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-30938-9
    DOI: 10.1038/s41467-022-30938-9
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    References listed on IDEAS

    as
    1. Deyuan Zou & Tian Chen & Wenjing He & Jiacheng Bao & Ching Hua Lee & Houjun Sun & Xiangdong Zhang, 2021. "Observation of hybrid higher-order skin-topological effect in non-Hermitian topolectrical circuits," Nature Communications, Nature, vol. 12(1), pages 1-11, December.
    2. Jiaming Li & Andrew K. Harter & Ji Liu & Leonardo de Melo & Yogesh N. Joglekar & Le Luo, 2019. "Observation of parity-time symmetry breaking transitions in a dissipative Floquet system of ultracold atoms," Nature Communications, Nature, vol. 10(1), pages 1-7, December.
    3. Linhu Li & Ching Hua Lee & Sen Mu & Jiangbin Gong, 2020. "Critical non-Hermitian skin effect," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
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    Cited by:

    1. Quan Lin & Wei Yi & Peng Xue, 2023. "Manipulating directional flow in a two-dimensional photonic quantum walk under a synthetic magnetic field," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    2. Peng Xue & Quan Lin & Kunkun Wang & Lei Xiao & Stefano Longhi & Wei Yi, 2024. "Self acceleration from spectral geometry in dissipative quantum-walk dynamics," Nature Communications, Nature, vol. 15(1), pages 1-11, December.

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