作者机构:[1]Department of Physics and Hebei Advanced Thin Films Laboratory, Hebei Normal University, Shijiazhuang 050016, China, [2]Department of Basic Courses, Hebei Botou Vocational College, Botou 062150, Hebei Proveince, China
相关基金:Project supported by the National Natural Science Foundation of China (Grant No. 10874039), and the Natural Science Foundation of Hebei Province of China (Grant Nos. A2009000246 and 2009000243).