1. State Key Laboratory of Environment-friendly Energy Materials
2. National Collaborative Innovation Center for Nuclear Waste and Environmental Safety
3. Southwest University of Science and Technology
4. Mianyang 621010
5. China
6. Applied Materials Physics
7. Department of Materials and Engineering
8. Royal Institute of Technology (KTH)
9. S-100 44 Stockholm
10. Sweden
11. Condensed Matter Theory Group
12. Materials Theory Division
13. Department of Physics and Astronomy
14. Uppsala University
15. 75120 Uppsala