1. Department of Physics
2. Nanyang Normal University
3. Nanyang 473061
4. China
5. Institute of Atomic and Molecular Physics
6. Sichuan University
7. Chengdu 610065
8. Department of Physics and High Pressure Science and Engineering Center
9. Centre for Science at Extreme Conditions and SUPA
10. School of Physics and Astronomy
11. The University of Edinburgh
12. Edinburgh EH9 3JZ
13. UK