1. National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
2. Center for Excellence in Superconducting Electronics, State Key Laboratory of Functional Material for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
3. Key Laboratory of Automobile Materials of MOE, State Key Laboratory of Superhard Materials, and School of Materials Science, Jilin University, Changchun 130012, China
4. National Institute for Materials Science, 1-1 Namiki Tsukuba, Ibaraki 305-0044, Japan
5. Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211-7010 ,United States