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Topological one-way fiber of second Chern number

Author

Listed:
  • Ling Lu

    (Chinese Academy of Sciences/Beijing National Laboratory for Condensed Matter Physics
    Songshan Lake Materials Laboratory)

  • Haozhe Gao

    (Chinese Academy of Sciences/Beijing National Laboratory for Condensed Matter Physics
    University of Chinese Academy of Sciences)

  • Zhong Wang

    (Tsinghua University
    Collaborative Innovation Center of Quantum Matter)

Abstract

One-way waveguides have been discovered as topological edge states in two-dimensional (2D) photonic crystals. Here, we design one-way fiber modes in a 3D magnetic Weyl photonic crystal realizable at microwave frequencies. We first obtain a 3D Chern crystal with a non-zero first Chern number by annihilating the Weyl points through supercell modulation. When the modulation becomes helixes, one-way modes develop along the winding axis, with the number of modes determined by the spatial frequency of the helix. These single-polarization single-mode and multi-mode one-way fibers, having nearly identical group and phase velocities, are topologically-protected by the second Chern number in the 4D parameter space of the 3D wavevectors plus the winding angle of the helix. This work suggests a unique way to utilize high-dimensional topological physics using topological defects.

Suggested Citation

  • Ling Lu & Haozhe Gao & Zhong Wang, 2018. "Topological one-way fiber of second Chern number," Nature Communications, Nature, vol. 9(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-07817-3
    DOI: 10.1038/s41467-018-07817-3
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