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Approaching the adiabatic infimum of topological pumps on thin-film lithium niobate waveguides

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  • Shengjie Wu

    (Nanjing University
    Nanjing University
    Nanjing University)

  • Wange Song

    (Nanjing University
    Nanjing University
    Nanjing University)

  • Jiacheng Sun

    (Nanjing University
    Nanjing University
    Nanjing University)

  • Jian Li

    (Nanjing University
    Nanjing University
    Nanjing University)

  • Zhiyuan Lin

    (Nanjing University
    Nanjing University
    Nanjing University)

  • Xuanyu Liu

    (Nanjing University
    Nanjing University
    Nanjing University)

  • Shining Zhu

    (Nanjing University
    Nanjing University
    Nanjing University)

  • Tao Li

    (Nanjing University
    Nanjing University
    Nanjing University)

Abstract

Topological pumps reveal topological insights of adiabatic mode evolution, in which adiabaticity plays a crucial role. However, the adiabatic infimum, i.e., the possible shortest evolution duration of an adiabatic topological pumping process, has remained elusive. In this study, we report the approach of adiabatic infimum in topological pumps in photonic waveguides based on the lithium niobate-on-insulator (LNOI) platform. Besides the most common way to achieve adiabaticity by slowing down the evolution of the system, the adiabaticity of a topological pump is also contingent on an effective Berry connection between instant eigenstates, which can be controlled by the selection of specific pump loops. Specifically, we develop a strategy to identify a pump loop with a minimized effective Berry connection, corresponding to the adiabatic infimum of a topological pump. As such, it is experimentally demonstrated that topological pumps can happen even with rapid evolution speed, at which the conventional pump would completely fail. The adiabatic infimum accelerates the topological pumps from the constraints of slow evolution and facilitates the design of compact topological devices.

Suggested Citation

  • Shengjie Wu & Wange Song & Jiacheng Sun & Jian Li & Zhiyuan Lin & Xuanyu Liu & Shining Zhu & Tao Li, 2024. "Approaching the adiabatic infimum of topological pumps on thin-film lithium niobate waveguides," Nature Communications, Nature, vol. 15(1), pages 1-6, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-54065-9
    DOI: 10.1038/s41467-024-54065-9
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    References listed on IDEAS

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    1. Zheng Wang & Yidong Chong & J. D. Joannopoulos & Marin Soljačić, 2009. "Observation of unidirectional backscattering-immune topological electromagnetic states," Nature, Nature, vol. 461(7265), pages 772-775, October.
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