College of Physics, Jilin University, Changchun, Jilin, P.R. China.|College of Physics, Jilin University, Changchun, Jilin, P.R. China.|College of Physics, Jilin University, Changchun, Jilin, P.R. China.|College of Physics, Jilin University, Changchun, Jilin, P.R. China.|College of Physics, Jilin University, Changchun, Jilin, P.R. China.|College of Physics, Jilin University, Changchun, Jilin, P.R. China.|College of Physics, Jilin University, Changchun, Jilin, P.R. China.