1. State Key Laboratory & College of Physics
2. Qingdao University
3. Qingdao 266071
4. PR China
5. Centre for Energy
6. Materials and Telecommunications
7. Institut National de la Recherche Scientifique
8. Varennes
9. Canada
10. Division of Materials Science
11. Department of Engineering Sciences and Mathematics
12. Luleå University of Technology
13. 971 87 Luleå
14. Sweden