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We report on the observation of photon helicity driven currents in graphene.The directed net electric current is generated in single layer graphene bycircularly polarized terahertz laser radiation at normal as well as at obliqueincidence and changes its sign upon reversing the radiation helicity. Thephenomenological and microscopic theories of the observed photocurrents aredeveloped. We demonstrate that under oblique incidence the current is caused bythe circular photon drag effect in the interior of graphene sheet. By contrast,the effect at normal incidence stems from the sample edges, which reduce thesymmetry and result in an asymmetric scattering of carriers driven by theradiation field. Besides a photon helicity dependent current we also observephotocurrents in response to linearly polarized radiation. The microscopicmechanisms governing this effect are discussed.

Photon helicity driven electric currents in graphene