作者机构:[1]Department of Physics, Zhejiang University, Hangzhou 310027, China, [2]Department of Physics, China Jiliang University, Hangzhou 310018, China, [3]Test and Analysis Center, Zhejiang University, Hangzhou 310028, China
相关基金:Project supported by the National Natural Science Foundation of China (Grant Nos 10574109 and 50701037) and the Zhejiang Provincial Science and Technology Department of China (Grant No 2005C24008).