1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603-146, Beijing, 100190, People's Republic of China
2. College of Science, Northeast Forestry University, Harbin 150040, People's Republic of China
3. Department of Chemical Physics, Lund University, Box 124, Lund 22100, Sweden
4. Institute of Theoretical Simulation Chemistry, Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology, Harbin 150080, People's Republic of China
5. Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada