1. School of Advanced Materials, Shenzhen Graduate School Peking University, Shenzhen 518055, China
2. Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
3. Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
4. Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
5. State Key Laboratory of Applied Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China