Affiliation: | ZHENG Qiang1,1) ZHI Qi-Jun2 ZHANG Xiao-Ping3 REN Zhong-Zhou3,2) 1 School of Mathematics and Computer Science,Guizhou Normal University,Guiyang 550001,China 2 School of Physics and Electronics,China 3 School of Physics,Nanjing University,Nanjing 210093,China |