作者机构:[1]Hefei Institutes of Physical Science, Chinese Academy of Science, Hefei 230031, P. R. China, [2]University of Science and Technology of China, Hefei 230026, P. R. China, [3]Changzhou Institute of Advanced Manufacturing Technology, Changzhou 213164, P. R. China
相关基金:This work is supported by the National Natural Science Foundation of China (No. 50905175), and the National Program on Key Basic Research Project of China (No. 2011CB302106).