作者机构:[1]Department of Modern Physics and Nonlinear Science Center, University of Science and Technology of China, Hefei 230026, China
相关基金:Project supported by the National Basic Research Program of China (No 2006CB705500), by the National Natural Science Foundation of China (Grant Nos 60744003, 10635040, 10532060 and 10472116), and the Specialized Research Fund for the Doctoral Program of Higher Education of China.