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\section{intro}  Graphene has garnered a lot of interest for its unique electronic properties and its potential applications. Graphene is \\  To illuminate properties of graphene, Zhaolin Lu et al describe optical properties based on small signal analysis. Thereis  are two absorption properties that are involved in light-graphene interaction, interband and intraband absorption, described by a complex conductivity $\sigma=\sigma_{intra}(\omega,\mu_c,\gamma,T)+\sigma_{inter}(\omega,\mu_c,\gamma,T)$ [1].