1. College of Physics and Electronic Information
2. Huaibei Normal University
3. Huaibei, P.R. China
4. State Key Lab of Advanced Technology for Materials Synthesis and Processing
5. Wuhan University of Technology
6. Wuhan, P.R. China
7. Laboratory of Nano-Fabrication and Novel Devices Integrated Technology
8. Institute of Microelectronics
9. Chinese Academy of Sciences
10. Beijing, P.R. China