1. School of Mathematics & Physics
2. Hebei University of Engineering
3. Handan 056038
4. China
5. Department of Physics
6. Department of Chemistry
7. Moscow State University
8. Moscow
9. Russia
10. Quantum-functional Semiconductor Research Center
11. Nano Information Technology Academy
12. Dongguk University
13. Seoul 100-715
14. Key Laboratory of Artificial Micro- and Nano-Materials of Ministry of Education
15. School of Physics and Technology
16. Wuhan University
17. Wuhan 430072