1. School of Electronic and Computer Engineering
2. Peking University
3. Shenzhen Graduate School
4. Shenzhen 518055
5. China
6. Faculty of Physics and Electronic Science
7. Hubei University
8. Hubei Key Laboratory of Ferro-& Piezoelectric Materials and Devices
9. Hubei Key Laboratory of Applied Mathematics
10. Wuhan 430062
11. Department of Physics
12. National Sun Yat-sen University
13. Kaohsiung 804
14. Taiwan
15. Institute of Materials and Optoelectronics