Affiliation: | 1. Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, P. R. China;2. Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, P. R. China;3. Department of Engineering Mechanics and Center for Nano and Micro Mechanics, Tsinghua University, Beijing, P. R. China;4. +8610‐6255‐9373 |