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We investigate the dynamics of photoexcited carriers and nonequilibriumphonons in graphene by solving the microscopic kinetic Bloch equations. Thepump and drift effects from the laser field as well as the relevant scatterings(including the Coulomb scattering with dynamic screening) are explicitlyincluded. When the pump-photon energy is high enough, the influence of thedrift term is shown to be negligible and the isotropic hot-electron Fermidistribution is established under the scattering during the linearly polarizedlaser pulse investigated here. However, in the case with low pump-phononenergy, the drift term is important and leads to a net momentum transfer fromthe electric field to electrons. Due to this net momentum and the dominantCoulomb scattering, a drifted Fermi distribution different from the oneestablished under static electric field is found to be established in severalhundred femtoseconds. We also show that the Auger process investigated in theliterature involving only the diagonal terms of density matrices is forbiddenby the dynamic screening. However, we propose an Auger process involving theinterband coherence and show that it contributes to the dynamics of carrierswhen the pump-photon energy is low. In addition, the anisotropicallymomentum-resolved hot-phonon temperatures due to the linearly polarized lightare also investigated, with the underlying physics revealed.

Microscopic theory of ultrafast dynamics of carriers photoexcited by THz and near-infrared linearly-polarized laser pulses in graphene