1. State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Qianjin Street 2699, Changchun 130012, China
2. State Key Laboratory of Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Science, P.O. Box 912, Beijing 100083, China
3. Key Laboratory of Materials Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450052, China
4. Advanced Semiconductor Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal, 2395-6900, Saudi Arabia