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\section{intro}  Graphene has garnered a lot of interest for its unique electronic properties and its potential applications. Graphene is \\  There are two absorption properties that are involved in light-graphene interaction, interband and intraband absorption for small signals.This signals. This  is described by the complex conductivity, $\sigma_g=\sigma_{intra}(\omega,\mu_c,\Gamma,T)+\sigma_{inter}(\omega,\mu_c,\Gamma,T)$