Momentum space toroidal moment in a photonic metamaterial

Biao Yang, Yangang Bi, Rui-Xing Zhang, Ruo-Yang Zhang, Oubo You, Zhihong Zhu, Jing Feng, Hongbo Sun, C. T. Chan (), Chao-Xing Liu () and Shuang Zhang ()
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Biao Yang: College of Advanced Interdisciplinary Studies & Hunan Provincial Key Laboratory of Novel Nano-Optoelectronic Information Materials and Devices, National University of Defense Technology
Yangang Bi: School of Physics and Astronomy, University of Birmingham
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
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

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: 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.

Date: 2021
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DOI: 10.1038/s41467-021-22063-w

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