1. Universidade de São Paulo, Escola de Engenharia de Lorena, DEMAR, 12612-550 Lorena, Brazil
2. Institute of Theoretical and Computational Physics, Graz University of Technology, NAWI Graz, 8010 Graz, Austria
3. Instituto de Ciências Tecnológicas e Exatas, Universidade Federal do Triângulo Mineiro, 38025-180 Uberaba, Minas Gerais, Brazil
4. Department of Physics, San Diego State University, San Diego, California 92182-1233, United States