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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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Field distribution of the Z_(2)topological edge state revealed by cathodoluminescence nanoscopy

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Opto-Electronic Advances 2022年第4期5卷 76-84页

作者： Xiao He Donglin Liu Hongfei Wang Liheng Zheng Bo Xu Biye Xie Meiling Jiang Zhixin Liu Jin Zhang Minghui Lu Zheyu Fang School of Physics State Key Lab for Mesoscopic PhysicsAcademy for Advanced Interdisciplinary StudiesCollaborative Innovation Center of Quantum Matterand Nano-optoelectronics Frontier Center of Ministry of EducationPeking University Yangtze Delta Institute of OptoelectronicsPeking UniversityBeijing 100871China National Laboratory of Solid State Microstructures Department of Materials Science and EngineeringNanjing UniversityNanjing 210093China College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China Department of Physics and HKU-UCAS Joint Institute for Theoretical and Computational Physics at Hong Kong the University of Hong KongPokfulam RoadHong KongChina

photonic topological insulators with robust boundary states can enable great applications for optical communication and quantum emission,such as unidirectional waveguide and single-mode ***,because of the diffraction limit of light,the physical insight of topological resonance remains unexplored in detail,like the dark line that exists with the crys-talline symmetry-protected topological edge ***,we experimentally observe the dark line of the Z_(2)photonic topo-logical insulator in the visible range by photoluminescence and specify its location by cathodoluminescence characteriza-tion,and elucidate its mechanism with the p-d orbital electromagnetic field distribution which calculated by numerical *** investigation provides a deeper understanding of Z_(2)topological edge states and may have great signific-ance to the design of future on-chip topological devices.

关键词： photonic topological insulator edge state cathodoluminescence TMDC

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

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Advanced photonics 2021年第5期3卷 44-51页

作者： Hua Zhong Shiqi Xia Yiqi Zhang Yongdong Li Daohong Song Chunliang Liu Zhigang Chen Xi’an Jiaotong University School 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 University TEDA Applied Physics Institute and School of PhysicsMOE Key Laboratory of Weak-Light Nonlinear PhotonicsTianjinChina San Francisco State University Department of Physics and AstronomySan FranciscoCaliforniaUSA

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.

关键词： photonic topological insulator type-ⅡDirac cone valley Hall edge soliton

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