1. State Key Laboratory for Mesoscopic Physics, Collaborative Innovation Center of Quantum Matter, School of Physics, Peking University, Beijing 100871, China
2. Department of Applied Physics, KTH Royal Institute of Technology, Electrum 229, 16440 Kista, Sweden
3. School of Materials Science & Engineering, Beijing Institute of Technology, 5 South Street of Zhongguancun, 100081 Beijing, China
4. Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, 5 South Street of Zhongguancun, 100081 Beijing, China