1. Hubei Yangtze Memory Laboratories 1 , Wuhan 430205, China
2. Institute of Microelectronics and Integrated Circuits, School of Microelectronics, Hubei University 2 , Wuhan 430062, China
3. School of Microelectronics, Southern University of Science and Technology 3 , Shenzhen 518055, China
4. Department of Electrical and Computer Engineering, University of California San Diego 4 , La Jolla, California 92093, USA
5. School of Physics and Microelectronics, Key Laboratory of Material Physics Ministry of Education, Zhengzhou University 5 , Zhengzhou, Henan 450052, People's Republic of China