Mono-Mono-Mono and Bi-Bi-Bi three-layer graphene systems’ optical conductivity
Subject Areas : International Journal of Bio-Inorganic Hybrid Nanomaterials
Keywords: Broadening width, Landau level, Optical conductivity, Three- layer Graphene,
Abstract :
Investigating the longitudinal optical conductivity of graphene systems, which is the mostimportant property for opto-electronic devices, for three-layer graphene systems theoretically andnumerically is the main purpose of this study. Each layer can be mono- or bi-layer graphene. Separationbetween layers has been denoted by d, selected to be about ten nanometers. The carrier densities ineach layer can be tuned by changing gate voltage. In these two dimensional layered structures; themain contributions to the optical conductivity are from the intra- and inter-band transition channels in asame layer. In this paper the graphene structure is described primarily, and the three-layer graphenesystems with composes of mono-mono-mono and bi-bi-bi has been defined. Using dielectric andelectron density-density correlation tensors, the imaginary part of dielectric function for the three-layergraphene systems are calculated and optical conductivities are plotted as a function of photon energiesin different broadening widths, for final stages.