1. State Key Laboratory of Super-hard Materials
2. College of Physics
3. Jilin University
4. Changchun 130012, China
5. Changchun Institute of Optics, Fine Mechanics and Physics
6. Chinese Academy of Sciences
7. Changchun 130033, China
8. State Key Laboratory of Rare Earth Resources Utilization
9. Changchun Institute of Applied Chemistry
10. Changchun 130022, China