1. Hylleraas Centre for Quantum Molecular Sciences, Department of Chemistry, University of Oslo, Box 1033, N-0315, Oslo, Norway
2. Laboratory of Theoretical and Computational Nanoscience, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Chinese Academy of Sciences, No. 11 Zhong Guan Cun Bei Yi Tiao, Beijing 100190, China
3. Institute for Integrated Cell-Material Sciences, Kyoto University, Rhom Plaza R312, Kyoto-daigaku-Katsura, Nishikyo-ku, Kyoto 615-8146, Japan