1. School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan 430074 China
2. Hubei Yangtze Memory Laboratories Wuhan 430205 China
3. School of Integrated Circuits Huazhong University of Science and Technology Wuhan 430074 China
4. Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 China