1. CAS Key Laboratory of Standardization and Measurement for NanotechnologyCAS Center for Excellence in NanoscienceNational Center for Nanoscience and Technology Beijing 100190 China
2. School of Future TechnologyUniversity of Chinese Academy of Sciences Beijing 100149 China
3. The State Key Laboratory of Nonlinear MechanicsInstitute of MechanicsChinese Academy of Sciences Beijing 100190 China
4. Department of Engineering MechanicsZhejiang University Hangzhou 310027 China