1. School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, People's Republic of China
2. Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, People's Republic of China
3. Mathematics and Physics Department, North China Electric Power University, Beijing 102206, People's Republic of China
4. Department of Physics, Wuhan University, Wuhan 430072, People's Republic of China