Institution: | Department of Physics, School of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran;Department of Physics and Astronomy, San Francisco State University, 1600 Holloway, San Francisco, CA 94132, USA;Department of Physics, Khayyam Institute of Higher Education, Mashhad, Iran;Department of Physics, Damghan University of Basic Sciences, Damghan, Iran |