Affiliation: | Chen Feng-Ping,Zhang Yu-Ming,Zhang Yi-Men,Tang XiaoYan,Wang Yue-Hu,Chen Wen-Ha(a) School of Microelectronics, Key Laboratory of Wide Band-Gap Semiconductor Materials and Devices Xidian University, Xi'an 710071, China ; b) School of Technical Physics, Xidian University, Xi'an 710071, China) |