1. School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, China
2. Department of Physics, Key Laboratory of Artificial Micro- and Nano-structures of the Ministry of Education, Wuhan University, Wuhan 430072, China
3. Mathematics and Physics Department, North China Electric Power, University, Beijing 102206, China
4. Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, China