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Frontiers of Physics

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Front. Phys.    2022, Vol. 17 Issue (5) : 53503    https://doi.org/10.1007/s11467-021-1149-7
RESEARCH ARTICLE
Vector valley Hall edge solitons in the photonic lattice with type-II Dirac cones
Yiqing Tian1, Yiqi Zhang1(), Yongdong Li1, R. Belić Milivoj2
1. Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique, School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an 710049, China
2. Science Program, Texas A&M University at Qatar, P.O. Box 23874 Doha, Qatar
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Abstract

Topological edge solitons represent a significant research topic in the nonlinear topological photonics. They maintain their profiles during propagation, due to the joint action of lattice potential and nonlinearity, and at the same time are immune to defects or disorders, thanks to the topological protection. In the past few years topological edge solitons were reported in systems composed of helical waveguide arrays, in which the time-reversal symmetry is effectively broken. Very recently, topological valley Hall edge solitons have been demonstrated in straight waveguide arrays with the time-reversal symmetry preserved. However, these were scalar solitary structures. Here, for the first time, we report vector valley Hall edge solitons in straight waveguide arrays arranged according to the photonic lattice with innate type-II Dirac cones, which is different from the traditional photonic lattices with type-I Dirac cones such as honeycomb lattice. This comes about because the valley Hall edge state can possess both negative and positive dispersions, which allows the mixing of two different edge states into a vector soliton. Our results not only provide a novel avenue for manipulating topological edge states in the nonlinear regime, but also enlighten relevant research based on the lattices with type-II Dirac cones.
Keywords valley Hall effect      topological edge soliton      photonic topological insulator     
Corresponding Author(s): Yiqi Zhang   
Issue Date: 28 March 2022
 Cite this article:   
Yiqing Tian,Yiqi Zhang,Yongdong Li, et al. Vector valley Hall edge solitons in the photonic lattice with type-II Dirac cones[J]. Front. Phys. , 2022, 17(5): 53503.
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https://academic.hep.com.cn/fop/EN/10.1007/s11467-021-1149-7
https://academic.hep.com.cn/fop/EN/Y2022/V17/I5/53503
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