Institution: | Department of Physics, Hebei University of Technology, Tianjin 300130, China Department of Applied Mathematics, Southwest Jiao Tong University, Chengdu 610031, China Department of Physics, Hebei University of Technology, Tianjin 300130, China Department of Physics, Hebei University of Technology, Tianjin 300130, China Department of Physics, Hebei University of Technology, Tianjin 300130, China |