1. Laboratoire de Matériaux Avancés, Université Badji-Mokhtar Annaba, B.P. 12, El-Hadjar 23000, Annaba, Algeria
2. Department of Physics, College of Science, University of Bahrain, PO Box 32038, Kingdom of Bahrain
3. Condensed Matter Theory Group, Materials Theory Division, Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden
4. Applied Materials Physics, Department of Materials and Engineering, Royal Institute of Technology (KTH), 100 44 Stockholm, Sweden