1. State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
2. Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada
3. National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
4. Graduate School of China Academy of Engineering Physics, Beijing 100193, China
5. Frontier Science Center for Quantum Information, Beijing 100084, China
6. Collaborative Innovation Center of Quantum Matter, Beijing 100084, China
7. Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing 210093, China