1. Department of Microelectronics, Key Laboratory of Micro-Nano Electronics and System Integration, School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi, China
2. Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi’an Jiaotong University, Xi’an, Shaanxi, China
3. School of Science, Xi’an Jiaotong University, Xi’an, Shaanxi, China