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Professor Hu Xiaoyong and Academician Gong Qihuang of the School of Physics of Peking University, Center for Frontier Science of Nano-Optoelectronics, State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, and Academician Gong Qihuang have made important progress in non-Hermitian topological photonics research: the development of A new method to study the effective Hamiltonian of a novel gain-loss domain wall topological optical system reveals the generation mechanism of topological states induced by gain-loss domain wal.
Non-Hermitian topological photonics systems have rich physical phenomena and important application potential, and have gradually become one of the international research fronts in the field of nanophotonics in recent yea.
The research team proposes a new method to construct the effective Hamiltonian of the system by introducing the coupling coefficients between different domain topological states, which provides a new research scheme for the study of new gain-loss domain wall topological optical syste.
Figure 1 (a) The parameter λ is introduced to fit the coupling term in the effective Hamiltoni.
Figure 2 By properly designing the distribution of gain and loss, angular states can be induced at different positions in a two-dimensional syst.
Li Yandong, a 2021 doctoral student at the School of Physics, Peking University, and Fan Chongxiao, a 2021 undergraduate graduate (now studying at the Max Planck Institute) are the co-first authors; Professor Hu Xiaoyong, School of Physics, Peking University, and Lu Cuicui, a permanent associate researcher at Beijing Institute of Technology , Professor Chen Ziting of Hong Kong University of Science and Technology is the co-corresponding author; other collaborators include Professor Dante.
The above research results are supported by the National Key R&D Program, the National Natural Science Foundation of China, the Collaborative Innovation Center for Quantum Matter Science, and the Collaborative Innovation Center for Extreme Opti.
