1. Chinese Academy of Sciences (CAS) Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology, Beijing 100190, China.
2. Department of Electrical and Computer Engineering and Texas Center for Superconductivity at the University of Houston (TcSUH), University of Houston, Houston, TX 77204, USA.
3. Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China.
4. School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, China.
5. Department of Physics and Texas Center for Superconductivity at the University of Houston (TcSUH), University of Houston, Houston, TX 77204, USA.
6. School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou, Guangdong 510006, China.
7. Materials Science and Engineering Program, University of Houston, Houston, TX 77204, USA.
8. Guangdong Provincial Key Laboratory of Optical Information Materials and Technology and Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China.
9. School of Materials Science and Engineering, Peking University, Beijing 100871 China.