Institute of Applied Physics, Chongqing University of Posts and Telecommunications, Chongqing 400065, China;
Institute of Applied Physics, Chongqing University of Posts and Telecommunications, Chongqing 400065, China;
Institute of Applied Physics, Chongqing University of Posts and Telecommunications, Chongqing 400065, China;
Institute of Applied Physics, Chongqing University of Posts and Telecommunications, Chongqing 400065, China;
Institute of Applied Physics, Chongqing University of Posts and Telecommunications, Chongqing 400065, China;
College of Physics, Southwest University, Chongqing 400715, China;
