Institution: | Yang Li-Yuan Zheng Xue-Feng Xue Xiao-Yong , Ma Xiao-Hua, Zhang Kai and HaG Yue a) Key Laboratory for Wide Band-Gap Semiconductor Materials and Devices, School of Microelectronics Xidian University, Xi'an 710071, China b) School of Technical Physics, Xidian University, Xi'an 710071, China |