Physics Department,Kunming University,Kunming 650214,China;
Department of Physics,Yunnan Normal University,Kunming 650092,China;
Physics Department,Kunming University,Kunming 650214,China;
Department of Information Management,Yunnan Normal University,Kunming 650092,China;
Department of Physics,Yunnan Normal University,Kunming 650092,China;
Physics Department,Kunming University,Kunming 650214,China;