作者机构:[1]Institute of Microelectronics, Xidian University, Xi 'an 710071, China
相关基金:Project supported by the National Natural Science Foundation of China (Nos. 60676009, 60725415, 60971066, 60803038) and the National High-Tech Program of China (Nos. 2009AA01 Z258, 2009AA01 Z260).