作者机构:[1]College of Physics and Electronic Science, Hubei Normal University, Huangshi 435002, China, [2]Department of Material Science and Engineering, University of Science and Technology of China, Hefei 230026, China
相关基金:Project supported by the National Natural Science Foundation of China (Grant No. 10904033), and the Natural Science Foundation of Hubei Province, China (Grant No. 2009CDA145).