Momentum space toroidal moment in a photonic metamaterial

被引:20
|
作者
Yang, Biao [1 ,2 ,3 ]
Bi, Yangang [4 ,5 ]
Zhang, Rui-Xing [6 ,7 ]
Zhang, Ruo-Yang [3 ]
You, Oubo [4 ]
Zhu, Zhihong [1 ,2 ]
Feng, Jing [5 ]
Sun, Hongbo [5 ,8 ]
Chan, C. T. [3 ]
Liu, Chao-Xing [9 ]
Zhang, Shuang [4 ,10 ,11 ]
机构
[1] Natl Univ Def Technol, Coll Adv Interdisciplinary Studies, Changsha, Peoples R China
[2] Natl Univ Def Technol, Hunan Prov Key Lab Novel Nanooptoelect Informat M, Changsha, Peoples R China
[3] Hong Kong Univ Sci & Technol, Dept Phys, Hong Kong, Peoples R China
[4] Univ Birmingham, Sch Phys & Astron, Birmingham, W Midlands, England
[5] Jilin Univ, Coll Elect Sci & Engn, State Key Lab Integrated Optoelect, Changchun, Peoples R China
[6] Univ Maryland, Dept Phys, Condensed Matter Theory Ctr, College Pk, MD 20742 USA
[7] Univ Maryland, Dept Phys, Joint Quantum Inst, College Pk, MD 20742 USA
[8] Tsinghua Univ, State Key Lab Precis Measurement Technol & Instru, Dept Precis Instrument, Beijing, Peoples R China
[9] Penn State Univ, Dept Phys, 104 Davey Lab, University Pk, PA 16802 USA
[10] Univ Hong Kong, Dept Phys, Hong Kong, Peoples R China
[11] Univ Hong Kong, Dept Elect & Elect Engn, Hong Kong, Peoples R China
关键词
D O I
10.1038/s41467-021-22063-w
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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 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. The appearance of toroidal multipolar moments in electrodynamics interrogates the question for their existence in Berry curvature, which can be seen as the "magnetic field" in the momentum space. Here, the authors observe 3D vortex distributions in the Berry curvature within a photonic metamaterial.
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页数:8
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