1. School of Microelectronics, Southern University of Science and Technology, Shenzhen, China
2. Key Laboratory of the Third Generation Semiconductor, Engineering Research Center of Integrated Circuits for Next-Generation Communications, Ministry of Education, GaN Device Engineering Technology Research Center of Guangdong, School of Microelectronics, Southern University of Science and Technology, Shenzhen, China
3. School of Microelectronics, Fudan University, Shanghai, China