作者机构:[1]School of Physics & Material Science, Anhui University, Hefei 230039, China, [2]Department of Physics, Shaoguan University, Shaoguan 512005, China
相关基金:The project supported by the Program for New Century Excellent Talents at Universities of China under Grant No. NCET-06-0554, National Natural Science Foundation of China under Grant Nos. 60677001 and 10747146, the Science-Technology Fund of Anhui Province for Outstanding Youth under Grant No. 06042087, the Key Fund of the Ministry of Education of China under Grant No. 206063, the Natural Science Foundation of Guangdong Province under Grant Nos. 06300345 and 7007806