1. Department of Physics, Sari Branch, Islamic Azad University, Sari, Iran
2. Faculty of Mazandaran Technical and Vocational University, Technical and Vocational University, Iran
3. Laboratoire de Physique Théorique et Modélisation, CNRS UMR 8089, Université de Cergy-Pontoise, F-95302 Cergy-Pontoise Cedex, France