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Moiré Fringe Induced Gauge Field in Photonics

Wenhui Wang, Wenlong Gao, Xiaodong Chen, Fulong Shi, Guixin Li, Jianwen Dong, Yuanjiang Xiang, and Shuang Zhang
Phys. Rev. Lett. 125, 203901 – Published 13 November 2020
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Abstract

We realize moiré fringe induced gauge field in a double-layer photonic honeycomb metacrystal with mismatched lattice constants. Benefitting from the generated strong effective gauge field, we report direct measurement of the band diagrams of both Landau level flat bands and intermagnetic-domain edge states. Importantly, we observe the correlation between the momentum and orbital position of the Landau modes, serving as an evidence of the noncommuteness between orthogonal components of the momentum. Without complicated time driving mechanics and careful site-by-site engineering, moiré superlattices could emerge as a powerful means to generate effective gauge fields for photonics benefiting from its simplicity and reconfigurability, which can be applied to nonlinearity enhancement and lasing applications at optical frequencies.

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  • Received 23 May 2020
  • Accepted 23 October 2020

DOI:https://doi.org/10.1103/PhysRevLett.125.203901

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Wenhui Wang1,*, Wenlong Gao1,*,†, Xiaodong Chen2,*, Fulong Shi2, Guixin Li3, Jianwen Dong2,‡, Yuanjiang Xiang4,§, and Shuang Zhang1,5,6,¶

  • 1School of Physics & Astronomy, University of Birmingham, Birmingham B15 2TT, United Kingdom
  • 2School of Physics & State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, China
  • 3Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
  • 4School of Physics and Electronics, Hunan University, Changsha 410082, China
  • 5Department of Physics, University of Hong Kong, Hong Kong, China
  • 6Department of Electrical & Electronic Engineering, University of Hong Kong, Hong Kong, China

  • *These authors contributed equally to this work.
  • bhamwxg334@gmail.com
  • dongjwen@mail.sysu.edu.cn
  • §xiangyuanjiang@126.com
  • s.zhang@bham.ac.uk

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Issue

Vol. 125, Iss. 20 — 13 November 2020

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