作者机构:[1]College of Physics, Liaoning University, Shenyang 110036, China, [2]Department of Mechanics, Faculty of Science, Beijing Institute of Technology, Beijing 100081, China
相关基金:Project supported by the National Natural Science Foundation of China (Grant Nos 10472040, 10572021 and 10772025) and the Outstanding Young Talents Training Found of Liaoning Province of China (Grant No 3040005).