1. State Key Laboratory of New Ceramics & Fine Processing
2. School of Material Science and Engineering
3. Tsinghua University
4. Beijing 100084
5. China
6. State Key Laboratory of Low-Dimensional Quantum Physics
7. Tsinghua-Foxconn Nanotechnology Research Center
8. Department of Physics
9. Collaborative Innovation Center of Quantum Matter
10. College of Materials Science and Chemical Engineering
11. Hainan University
12. Haikou 570228