1. Laboratoire de Physique Computationnelle des Matériaux, Université Djillali Liabès de Sidi Bel-Abbès, Sidi Bel-Abbès 22000, Algeria
2. Nanotechnology Centre, University of Bahrain, P. O. Box 32038, Kingdom of Bahrain
3. Department of Physics, College of Science, University of Bahrain, P. O. Box 32038, Kingdom of Bahrain