Institution: | a SISSA, International School for Advanced Studies, via Beirut 2-4, 34151 Trieste, Italy b Physics Department, Faculty of Science, Razi University, Kermanshah, Iran c Nano Science and Nano Technology Research Center, Razi University, Kermanshah, Iran d Computational Physics Laboratory, Department of Nano-Science, Institute for Research in Fundamental Science (IPM), PO Box 19395-5531, Tehran, Iran |