We analyze the possibility of optical generation of charge and spin currents in graphene by light carrying an orbital angular momentum (OAM). The graphene is assumed to be deposited on a substrate that induces Rashba spin-orbit coupling. In addition, a weak external magnetic field is assumed to be applied in the plane of graphene. We show that the photon absorption and the magnitude of the generated charge and spin currents depend remarkably on the parameters characterizing the light with OAM.

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40.

For example, we calculate the light-generated spin Si as a change of the mean value of spin operator Ŝx, associated with the transition of the electron from the state |nk to the state |nk, multiplied by the probability of optical transition between these states.

41.

The direction of spin polarization is determined by vector B0. The current flows in the direction defined by (n×B0), where n is a unit vector perpendicular to the 2D plane and its orientation is determined by the sign of Rashba coupling.

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