1. State Key Laboratory of Electronic Thin Films and Integrate Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
2. Department of Electrical and Computer Engineering, University of California, Riverside, California 92521, United States
3. Integrated Service Technology, Shanghai, China
4. Department of Electronics Engineering and Institute of Electronics, National Chiao Tung University, Hsinchu, 300, Taiwan