1. School of Electronic Information, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, China
2. School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
3. Wuhan National High Magnetic Field Center and School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
4. Institute of Microelectronics and Key Laboratory of Microelectronic Devices and Circuits and Frontiers Science Center for Nano-optoelectronics, Peking University, Beijing 100871, China