1. Department of Physics; University of Peshawar; Peshawar Pakistan
2. School of Mathematics and Statistics; University of St Andrews; St Andrews UK
3. Theoretical Physics Division (TPD); PINSTECH; P. O. Nilore Islamabad 44000 Pakistan
4. National Center for Physics (NCP); Quaid-i-Azam University Campus; Shahdra Valley Road, Islamabad 44000 Pakistan
5. Department of Physics; Kohat University of Science & Technology (KUST); Kohat Pakistan