Affiliation: | 1. National Center for NanoScience & Technology, 2 ZhongGuanCun North 1st Street, Beijing, 100080 (P.R. China);2. Graduate School of the Chinese Academy of Sciences, Beijing, 100864 (P.R. China);3. School of Physics, Peking University, Beijing, 100871 (P.R. China);4. Institute of Chemistry, Chinese Academy of Sciences, ZhongGuanCun North 1st Street, Beijing, 100080 (P.R. China) |