Nonlinear topological valley Hall edge states arising from type-Ⅱ Dirac cones

作     者：Hua Zhong Shiqi Xia Yiqi Zhang Yongdong Li Daohong Song Chunliang Liu Zhigang Chen 

作者机构：Xi’an Jiaotong UniversitySchool of Electronic Science and EngineeringKey Laboratory for Physical Electronics and Devices of the Ministry of Education&Shaanxi Key Lab of Information Photonic TechniqueFaculty of Electronic and Information EngineeringXi’anChina Nankai UniversityTEDA Applied Physics Institute and School of PhysicsMOE Key Laboratory of Weak-Light Nonlinear PhotonicsTianjinChina San Francisco State UniversityDepartment of Physics and AstronomySan FranciscoCaliforniaUSA 

出 版 物：《Advanced Photonics》 (先进光子学（英文）)

年 卷 期：2021年第3卷第5期

页      面：44-51页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0702[理学-物理学] 

基　　金：supported by the National Key R&D Program of China(No.2017YFA0303800) the National Natural Science Foundation of China(Nos.12074308,11922408,11674180,and U1537210) the Fundamental Research Funds for the Central Universities(Nos.xzy012019038 and 63213041) 

主　　题：photonic topological insulator type-ⅡDirac cone valley Hall edge soliton 

摘      要：A Dirac point is a linear band crossing point originally used to describe unusual transport properties of materials like *** 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 *** endeavors,however,have focused mainly on linear topological states in real or synthetic Dirac/Weyl *** propose and demonstrate nonlinear valley Hall edge(VHE)states in laserwritten anisotropic photonic lattices hosting innately the type-Ⅱ Dirac *** 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 *** 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.