1. State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
2. Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, China
3. School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
4. School of Materials, University of Manchester, Manchester M13 9PL, United Kingdom
5. Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, United States
6. Department of Physics, Penn State University, State College, Pennsylvania 16801, United States
7. Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
8. Shanghai Research Center for Quantum Sciences, Shanghai 201315, China