College of Physics and Electronic Information Science, Tianjin Normal University, Tianjin 300387;
College of Physics and Electronic Information Science, Tianjin Normal University, Tianjin 300387;
College of Physics and Electronic Information Science, Tianjin Normal University, Tianjin 300387;
College of Physics and Electronic Information Science, Tianjin Normal University, Tianjin 300387;
College of Physics and Electronic Information Science, Tianjin Normal University, Tianjin 300387;