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Momentum space toroidal moment in a photonic metamaterial

Author

Listed:
  • Biao Yang

    (College of Advanced Interdisciplinary Studies & Hunan Provincial Key Laboratory of Novel Nano-Optoelectronic Information Materials and Devices, National University of Defense Technology
    The Hong Kong University of Science and Technology)

  • Yangang Bi

    (School of Physics and Astronomy, University of Birmingham
    Jilin University)

  • Rui-Xing Zhang

    (University of Maryland)

  • Ruo-Yang Zhang

    (The Hong Kong University of Science and Technology)

  • Oubo You

    (School of Physics and Astronomy, University of Birmingham)

  • Zhihong Zhu

    (College of Advanced Interdisciplinary Studies & Hunan Provincial Key Laboratory of Novel Nano-Optoelectronic Information Materials and Devices, National University of Defense Technology)

  • Jing Feng

    (Jilin University)

  • Hongbo Sun

    (Jilin University
    Tsinghua University)

  • C. T. Chan

    (The Hong Kong University of Science and Technology)

  • Chao-Xing Liu

    (The Pennsylvania State University)

  • Shuang Zhang

    (School of Physics and Astronomy, University of Birmingham
    The University of Hong Kong
    The University of Hong Kong)

Abstract

Berry curvature, the counterpart of the magnetic field in the momentum space, plays a vital role in the transport of electrons in condensed matter physics. It also lays the foundation for the emerging field of topological physics. In the three-dimensional systems, much attention has been paid to Weyl points, which serve as sources and drains of Berry curvature. Here, we demonstrate a toroidal moment of Berry curvature with flux approaching to π in judiciously engineered metamaterials. The Berry curvature exhibits a vortex-like configuration without any source and drain in the momentum space. Experimentally, the presence of Berry curvature toroid is confirmed by the observation of conical-frustum shaped domain-wall states at the interfaces formed by two metamaterials with opposite toroidal moments.

Suggested Citation

  • Biao Yang & Yangang Bi & Rui-Xing Zhang & Ruo-Yang Zhang & Oubo You & Zhihong Zhu & Jing Feng & Hongbo Sun & C. T. Chan & Chao-Xing Liu & Shuang Zhang, 2021. "Momentum space toroidal moment in a photonic metamaterial," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-22063-w
    DOI: 10.1038/s41467-021-22063-w
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    Cited by:

    1. Xiaoxiao Wu & Haiyan Fan & Tuo Liu & Zhongming Gu & Ruo-Yang Zhang & Jie Zhu & Xiang Zhang, 2022. "Topological phononics arising from fluid-solid interactions," Nature Communications, Nature, vol. 13(1), pages 1-7, December.

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