1. State Key Laboratory of Functional Materials for Informatics
2. Shanghai Institute of Micro-system and Information Technology
3. Chinese Academy of Sciences
4. 200050 Shanghai
5. China
6. Key Laboratory of Polar Materials and Devices
7. Ministry of Education
8. Department of Electronics
9. East China Normal University
10. 200241 Shanghai
11. National Laboratory of Solid State Microstructures
12. Nanjing University
13. 210093 Nanjing