1. Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, P. R. China
2. College of Information Technology, Jilin Normal University, Siping 136000, P. R. China
3. Department of Physics, City University of Hong Kong, Hong Kong SAR, P. R. China
4. Shenzhen JL Computational Science and Applied Research Institute, Shenzhen 518110, P. R. China