1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2. School of Materials Science and Engineering, Nanchang University, Nanchang 30031, China
3. Department of Physical Science, University of Chinese Academy of Sciences, Beijing 100049, China
4. Beijing Key Laboratory for Advanced Functional Materials and Structure Research, Beijing 100190, China
5. Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
6. Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
7. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China