作者机构:[1]School of Physics, Shandong University, Jinan 250100, China, [2]State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
相关基金:Project supported by the State Key Program of National Natural Science of China (Grant Nos 10474056 and 10574082) and the Natural Science Foundation of Shandong Province (Grant No Z2005A01).