Institution: | 1.Department of Physics, Jiangsu University of Science and Technology, Zhenjiang 212003, China;2.Department of Physics, East China Normal University, Shanghai 200062, China;3.Département de Physique, Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada;4.Department of Physics, Xinjiang Normal University, Urumuchi 830054, China |