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Relaxation Of Optically Excited Carriers In Graphene, Raseong Kim, Vasili Perebeinos, Phaedon Avouris
Relaxation Of Optically Excited Carriers In Graphene, Raseong Kim, Vasili Perebeinos, Phaedon Avouris
Birck and NCN Publications
We explore the relaxation of photoexcited graphene by solving a transient Boltzmann transport equation with electron-phonon (e-ph) and electron-electron (e-e) scattering. Simulations show that when the excited carriers are relaxed by e-ph scattering only, a population inversion can be achieved at energies determined by the photon energy. However, e-e scattering quickly thermalizes the carrier energy distributions washing out the negative optical conductivity peaks. The relaxation rates and carrier multiplication effects are presented as a function of photon energy, graphene doping, and dielectric constant.