1. Key Laboratory of Materials Physics
2. Anhui Key Laboratory of Nanomaterials and Nanostructures
3. Institute of Solid State Physics
4. Chinese Academy of Sciences
5. Hefei 230031
6. Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information and Quantum Physics
7. University of Science and Technology of China
8. Hefei
9. China