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We calculate electron-hole generation and recombination rates for Coulomb scattering (Auger recombination and impact ionization) in zero band-gap graphene. The conduction and valence band dispersion relation in graphene together with energy and momentum conservation requirements restrict the phase space for Coulomb scattering so that electron-hole recombination times can be much longer than 10. 3em{0ex}ps for electron-hole densities smaller than 10^120. 3em{0ex}cm^-2.
Farhan Rana (Wed,) studied this question.