| Affiliation: | 1. School of Physics, Northwest University, Xi’an, Shaanxi 710069, China;2. National Key Laboratory of Photoelectric Technology and Functional Materials (Culture Base), and Institute of Photonics and Photon-Technology, Northwest University, Xi’an, Shaanxi 710069, China;1. School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing 100044, China;2. College of Science, Minzu University of China, Beijing 100081, China;1. Instituto de Física, Universidade Federal de Alagoas, 57072-970, Maceió-AL, Brazil;2. Departamento de Física, Universidade Federal do Paraná, 81531-990, Curitiba-PR, Brazil |
