1. College of Electrical and Information Engineering, Southwest University for Nationalities, Chengdu 610041, Sichuan, People’s Republic of China.
2. School of Mathematic and Physical Science, Xuzhou Institute of Technology, Xuzhou221111, Jiangsu, People’s Republic of China.
3. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, Sichuan, People’s Republic of China.