1. International Center for New-Structured Materials (ICNSM), Laboratory of New-Structured Materials, and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
2. State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, People's Republic of China
3. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, People's Republic of China
4. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201203, People's Republic of China