Study Of Electron Density Changing Effects on Optical Conductivity of Three_layer Graphene System, With Compose of Mono_Bi_Mono

We investigate the longitudinal Optical Conductivity of spatially separated three_layer graphene with compose of mono_bi_mono. Dielectric tensor obtained from electron density_density corrolation function. Then total optical coductivity has been caculated from imaginary part of three_layer graphene dielectric function , and ploted as a function of photon energy for constant broadening width and different electron densities, for different layers. Finally results are discussed and evaluated