Relaxation of Optically Excited Carriers in Graphene

Details Relaxation of Optically Excited Carriers in Graphene Relaxation of Optically Excited Carriers in Graphene

2011-03-29

arxiv.org/abs/1103.5523v1

Phys. Rev. B 84, 075449 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.84.075449

We explore the relaxation of photo-excited 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 and dielectric constant.

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