College of Physics and Electronic Information, Yunnan Normal University, Kunming 650500, China;
Faculty of Materials, Optoelectronics and Physics, Xiangtan University, Xiangtan 411105, China;
Faculty of Materials, Optoelectronics and Physics, Xiangtan University, Xiangtan 411105, China;
College of Physics and Electronic Information, Yunnan Normal University, Kunming 650500, China;
College of Physics and Electronic Information, Yunnan Normal University, Kunming 650500, China;