Investigating the Longitudinal Optical Conductivity in Three-Layer Graphene Systems with Composes Mono-Bi-Bi and Bi-Mono-Bi and Bi-Bi-Mono
Subject Areas : International Journal of Bio-Inorganic Hybrid Nanomaterials
Keywords: Optical conductivity, Electron density, Fermi Energy, Three-layer Graphene,
Abstract :
The longitudinal optical conductivity is the most important property for graphene-baseddevices. So investigating this property for spatially separated few-layer graphene systems analyticallyand numerically is the main purpose of our study. Each layer can be mono- or bi-layer graphene. Thedensity-density correlation function has been screened by the dielectric function using the randomphase approximation, which includes the inter-layer Coulomb coupling. By using Kronecker delta anddielectric tensors, the optical conductivity, is calculated, and plotted as a function of photon energyfor three-layer graphene systems with composes mono-bi-bi, bi-mono-bi, and bi-bi-mono in differentbroadening widths. In the presence of the potential function between the layers, the carrier densities ineach layer can be tuned respectively. In these two dimensional layered structures; the main contributionsto the optical conductivity are from the intra- and inter-band transition channels in a same layer.