1. Department of Mathematics and Physics, Chongqing University of Posts and Telecommunications, 2 Chongwen Road, Chongqing 400065, China
2. State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888 Eastern South Lake Road, Changchun 130033, China
3. College of Physics, Liaoning University, 66 Chongshan Middle Road, Shenyang 110036, China
4. School of Science, Chongqing University of Technology, 69 Hongguang Street, Chongqing 400054, China