Affiliation: | 1 Institute for Physical Science and Technology, University of Maryland, College Park, MD, 20742, USA 2 Departamento de Fısica, Universidade Federal do Paraná, 81531-990, Curitiba, PR, Brazil 3 Departamento de Fısica, Universidade Estadual de Ponta Grossa, Ponta Grossa, PR, Brazil |