Authors
Lijuan Fu
School of Physics and Electronic Science, Shandong Normal University, Jinan, China
Shuxing Fan
School of Physics and Electronic Science, Shandong Normal University, Jinan, China
Zhao Wang
School of Physics and Electronic Science, Shandong Normal University, Jinan, China
Wei Tang
School of Physics and Electronic Science, Shandong Normal University, Jinan, China