1. State Key Laboratory of Functional Materials
for Informatics, Shanghai Institute of Microsystem and Information
Technology, Chinese Academy of Sciences, Shanghai 200050, China
2. Department of Physics, East China Normal University, Shanghai 200241, China
3. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
4. Department
of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong 999077, China
5. Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, United States
6. Institute of Textiles and Clothing, Hong Kong Polytechnic University, Kowloon, Hong Kong 999077, China