1. Department of Microelectronics, School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi, China
2. Key Laboratory for Physical Electronics and Devices, Ministry of Education, Xi’an Jiaotong University, Xi’an, Shaanxi, China
3. 13th Research Institute of China Electronics Technology Group Corporation, Shijiazhuang, Hebei, China