1. State Key Laboratory of Integrated Opoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
2. School of Information Engineering, Minzu University of China, Beijing 100081, China
3. College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
4. State Key Laboratory of Crystal Materials, Shandong University, Jinan 250022, China