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 10.3em0exps for electron-hole densities smaller than 10¹²0.3em0excm^-2.
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Farhan Rana (2007) studied this question.
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