1. Department of Physics and Astronomy, University of California, Riverside, California 92521, United States
2. Department of Materials Science and Engineering, University of California, Riverside, California 92521, United States
3. School of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, China
4. 2020 X-Lab, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
5. State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
6. Department of Physics and Applied Physics, Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, United States