Affiliation: | 1.Department of Mathematics, Namal Institute, 30 km Talagang Road, Mianwali, 42250, Pakistan ;2.Centre for Micro and Nano Devices (CMND), Department of Physics, COMSATS University, Park Road, Islamabad, 44000, Pakistan ;3.Department of Physics, International Islamic University, H-10, Islamabad, 44000, Pakistan ; |