Nonlinear level attraction of cavity axion polariton in antiferromagnetic topological insulator

Yang Xiao, Huaiqiang Wang, Dinghui Wang, Ruifeng Lu, Xiaohong Yan, Hong Guo, C.-M. Hu, Ke Xia, Haijun Zhang, and Dingyu Xing
Phys. Rev. B 104, 115147 – Published 23 September 2021

Abstract

Strong coupling between cavity photons and elementary excitations in condensed matters boosts the field of light-matter interaction and generates several exciting subfields, such as cavity optomechanics and cavity magnon polariton. Axion quasiparticles, emerging in topological insulators, were predicted to strongly couple with the light and generate the so-called axion polariton. Here we demonstrate that there arises a gapless level attraction (LA) of cavity axion polariton in an antiferromagnetic topological insulator, which originates from the high-order interaction between the axion and the odd-order resonance of a cavity. Such a novel coupling mechanism is essentially different from conventional LAs with the linear-order interaction. Our results open up promising roads for exploring the axion polariton with cavity technologies.

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  • Received 22 February 2021
  • Revised 6 August 2021
  • Accepted 14 September 2021

DOI:https://doi.org/10.1103/PhysRevB.104.115147

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yang Xiao1,*, Huaiqiang Wang2,3,*, Dinghui Wang2, Ruifeng Lu4, Xiaohong Yan5, Hong Guo6, C.-M. Hu7, Ke Xia8, Haijun Zhang2,9,†, and Dingyu Xing2,9

  • 1College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • 2National Laboratory of Solid State Microstructures and Physics School, Nanjing University, Nanjing 210093, China
  • 3Department of Physics, University of Zurich, Zurich 8057, Switzerland
  • 4Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094, China
  • 5School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China
  • 6Department of Physics, McGill University, Montreal, Quebec H3A 2T8, Canada
  • 7Department of Physics and Astronomy, University of Manitoba, Winnipeg R3T 2N2, Canada
  • 8Beijing Computational Science Research Center, Beijing 100193, China
  • 9Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China

  • *These authors contributed equally to this work.
  • zhanghj@nju.edu.cn

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Vol. 104, Iss. 11 — 15 September 2021

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