1. School of Microelectronics, Xi’an Jiaotong University, Xi’an 710049, China
2. State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China
3. Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique, School of Electronics & Information Engineering, Xi’an Jiaotong University, Xi’an 710049, China
4. University of Chinese Academy of Sciences (UCAS), Beijing 100049, China