1. Laboratory of Advanced Materials Physics and Nanodevices
2. School of Physics and Technology
3. University of Jinan
4. Jinan 250022
5. China
6. Department of Physics
7. Shanghai Normal University
8. Shanghai 200234
9. Department of Applied Physics
10. Xi'an University of Technology
11. Xi'an 710049
12. New Industry Creation Hatchery Center
13. Tohoku University
14. Sendai
15. Japan