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Bound-in-continuum-like corner states in the type-II Dirac photonic lattice

Author

Listed:
  • Feng, Suge
  • Zhong, Hua
  • Belić, Milivoj R.
  • Mihalache, Dumitru
  • Li, Yongdong
  • Zhang, Yiqi

Abstract

Dirac points are special points in the energy band structure of various materials, around which the dispersion is linear. If the corresponding Fermi surface is projected as a pair of crossing lines—or touching cones in two dimensions, the Dirac point is known as the type-II; such points violate the Lorentz invariance. Until now, thanks to its unique characteristics, the Klein tunneling is successfully mimicked and the topological edge solitons are obtained in the type-II Dirac photonic lattices that naturally possess type-II Dirac points. However, the interplay between these points and corner states is still not investigated. Here, we report both linear and nonlinear corner states in the type-II Dirac photonic lattice with elaborate boundaries. The states, classified as in-phase and out-of-phase, hide in the extended bands that are similar to the bound states in the continuum (BIC). We find that the nonlinear BIC-like corner states are remarkably stable. In addition, by removing certain sites, we establish the fractal Sierpiński gasket structure in the type-II Dirac photonic lattice, in which the BIC-like corner states are also demonstrated. The differences between results in the fractal and nonfractal lattices are rather small. Last but not least, the corner breather states are proposed. Our results provide a novel view on the corner states and may inspire fresh ideas on how to manipulate/control the localized states in different photonic lattices.

Suggested Citation

  • Feng, Suge & Zhong, Hua & Belić, Milivoj R. & Mihalache, Dumitru & Li, Yongdong & Zhang, Yiqi, 2024. "Bound-in-continuum-like corner states in the type-II Dirac photonic lattice," Chaos, Solitons & Fractals, Elsevier, vol. 181(C).
  • Handle: RePEc:eee:chsofr:v:181:y:2024:i:c:s0960077924002716
    DOI: 10.1016/j.chaos.2024.114719
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    References listed on IDEAS

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    1. Charlie-Ray Mann & Thomas J. Sturges & Guillaume Weick & William L. Barnes & Eros Mariani, 2018. "Manipulating type-I and type-II Dirac polaritons in cavity-embedded honeycomb metasurfaces," Nature Communications, Nature, vol. 9(1), pages 1-11, December.
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    3. Alexey A. Soluyanov & Dominik Gresch & Zhijun Wang & QuanSheng Wu & Matthias Troyer & Xi Dai & B. Andrei Bernevig, 2015. "Type-II Weyl semimetals," Nature, Nature, vol. 527(7579), pages 495-498, November.
    4. Tang, Qian & Zhang, Yiqi & Kartashov, Yaroslav V. & Li, Yongdong & Konotop, Vladimir V., 2022. "Vector valley Hall edge solitons in superhoneycomb lattices," Chaos, Solitons & Fractals, Elsevier, vol. 161(C).
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