作者机构:[1]School of Physics & Material Science, Anhui University, Hefei 230039, China, [2]Department of Physics, Shaoguan University, Sha~guan 512005, China
相关基金:Supported by the Specialized Research Fund for the Doctoral Program of Higher Education under Grant No. 20103401110007, the National Natural Science Foundation of China under Grant Nos. 10874122, 10975001, 51072002, 51272003, the Program for Excellent Talents at the University of Guangdong, (Guangdong Teacher Letter [1010] No. 79), and the 211 Project of Anhui University