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