1. State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
2. Institute of Materials Physics, Westfälische Wilhelms-Universität Münster, Münster 48149, Germany
3. School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
4. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
5. State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
6. Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China