Vector valley Hall edge solitons in distorted type-II Dirac photonic lattices. Academic Article uri icon


  • Topological edge states have recently garnered a lot of attention across various fields of physics. The topological edge soliton is a hybrid edge state that is both topologically protected and immune to defects or disorders, and a localized bound state that is diffraction-free, owing to the self-balance of diffraction by nonlinearity. Topological edge solitons hold great potential for on-chip optical functional device fabrication. In this report, we present the discovery of vector valley Hall edge (VHE) solitons in type-II Dirac photonic lattices, formed by breaking lattice inversion symmetry with distortion operations. The distorted lattice features a two-layer domain wall that supports both in-phase and out-of-phase VHE states, appearing in two different band gaps. Superposing soliton envelopes onto VHE states generates bright-bright and bright-dipole vector VHE solitons. The propagation dynamics of such vector solitons reveal a periodic change in their profiles, accompanied by the energy periodically transferring between the layers of the domain wall. The reported vector VHE solitons are found to be metastable.

published proceedings

  • Opt Express

author list (cited authors)

  • Tian, Y., Wang, Y., Beli, M. R., Zhang, Y., Li, Y., & Ye, F.

complete list of authors

  • Tian, Yiqing||Wang, Yudian||Belić, Milivoj R||Zhang, Yiqi||Li, Yongdong||Ye, Fangwei

publication date

  • June 2023