• Advanced Photonics
  • Vol. 3, Issue 5, 056001 (2021)
Hua Zhong1、†, Shiqi Xia2, Yiqi Zhang1、*, Yongdong Li1, Daohong Song2、*, Chunliang Liu1, and Zhigang Chen2、3、*
Author Affiliations
  • 1Xi’an Jiaotong University, School of Electronic Science and Engineering, Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique, Faculty of Electronic and Information Engineering, Xi’an, China
  • 2Nankai University, TEDA Applied Physics Institute and School of Physics, MOE Key Laboratory of Weak-Light Nonlinear Photonics, Tianjin, China
  • 3San Francisco State University, Department of Physics and Astronomy, San Francisco, California, USA
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    DOI: 10.1117/1.AP.3.5.056001 Cite this Article Set citation alerts
    Hua Zhong, Shiqi Xia, Yiqi Zhang, Yongdong Li, Daohong Song, Chunliang Liu, Zhigang Chen. Nonlinear topological valley Hall edge states arising from type-II Dirac cones[J]. Advanced Photonics, 2021, 3(5): 056001 Copy Citation Text show less

    Abstract

    A Dirac point is a linear band crossing point originally used to describe unusual transport properties of materials like graphene. In recent years, there has been a surge of exploration of type-II Dirac/Weyl points using various engineered platforms including photonic crystals, waveguide arrays, metasurfaces, magnetized plasma and polariton micropillars, aiming toward relativistic quantum emulation and understanding of exotic topological phenomena. Such endeavors, however, have focused mainly on linear topological states in real or synthetic Dirac/Weyl materials. We propose and demonstrate nonlinear valley Hall edge (VHE) states in laser-written anisotropic photonic lattices hosting innately the type-II Dirac points. These self-trapped VHE states, manifested as topological gap quasi-solitons that can move along a domain wall unidirectionally without changing their profiles, are independent of external magnetic fields or complex longitudinal modulations, and thus are superior in comparison with previously reported topological edge solitons. Our finding may provide a route for understanding nonlinear phenomena in systems with type-II Dirac points that violate the Lorentz invariance and may bring about possibilities for subsequent technological development in light field manipulation and photonic devices.

    Video Introduction to the Article

    iψ(ξ,η,ζ)ζ=12k0(2ξ2+2η2)ψ(ξ,η,ζ)k0Δn(ξ,η)n0ψ(ξ,η,ζ),

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    Δn(ξ,η)=12n03γ33E011+I(ξ,η),

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    iψ(x,y,z)z=12(2x2+2y2)ψ(x,y,z)k02r02Δn(x,y)n0ψ(x,y,z),

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    Δn(x,y,z)=12n03γ33E011+I(x,y)+|ψ(x,y,z)|2,

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    Hua Zhong, Shiqi Xia, Yiqi Zhang, Yongdong Li, Daohong Song, Chunliang Liu, Zhigang Chen. Nonlinear topological valley Hall edge states arising from type-II Dirac cones[J]. Advanced Photonics, 2021, 3(5): 056001
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