1. Beijing Computational Science Research Center, Haidian District, Beijing 100193, China
2. College of Physics, Qingdao University, No. 308 Ningxia Road, Qingdao 266071, China
3. Physics and Chemistry of Materials, Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
4. Department of Chemistry, The University of Hong Kong, Pok Fu Lam, Hong Kong