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Graphene has been shown to exhibit a nonlinear response due to its uniqueband structure. In this paper, we study the terahertz (THz) response metallicarmchair graphene nanoribbons, specifically current density and Rabioscillations beyond the semiclassical Boltzman model. We performed quantummathematical modeling by first finding a solution to the unperturbedHamiltonian for a single Fermion in the dipole gauge and then applying apolarized, THz electrical field. After writing the solution in terms of thefour eigenstates of the Dirac system, we numerically calculated the $x$ and $y$components of the induced current density resulting from applying the terahertzelectrical field. Due to the inclusion of the Rabi Oscillation in ourcalculation of the optical response, we predict both odd and even harmonics, aswell as continuum oscillations of the power density spectrum in the THz regime.Lastly, we show a rapid decay of the power harmonics.

Third-order terahertz optical response of graphene in the presence of Rabi Oscillations