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Vector valley Hall edge solitons in the photonic lattice with type-Ⅱ Dirac cones

Frontiers of physics 2022年第5期17卷 75-82页

作者： Yiqing Tian Yiqi Zhang Yongdong Li Milivoj RBelić Key Laboratory for Physical Electronics and Devices of the Ministry of Education&Shaanxi Key Lab of Information Photonic Technique School of Electronic and Information EngineeringXi’an Jiaotong UniversityXi’an 710049China Science Program Texas A&M University at QatarP.O.Box 23874 DohaQatar

topological edge solitons represent a significant research topic in the nonlinear topological *** 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 *** the past few years topological edge solitons were reported in systems composed of helical waveguide arrays,in which the time-reversal symmetry is effectively *** recently,topological valley Hall edge solitons have been demonstrated in straight waveguide arrays with the time-reversal symmetry ***,these were scalar solitary ***,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 *** 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 *** 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.

关键词： valley Hall effect topological edge soliton photonic topological insulator

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