作者机构:[1]Department of Physics, Southeast University, Nanjing 211189, China
相关基金:Project supported by the National Natural Science Foundation of China (Grant No. 11004029), the Natural Science Foundation of Jiangsu Province, China (Grant No. BK2010422), the Ph.D. Program Foundation of the Ministry of Education of China, the Excellent Young Teachers Program of Southeast University, and the National Basic Research Development Program of China (Grant No. 2011CB921203).