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Illumination of a two-dimensional system by a twisted light beam isconsidered in order to find specific effects caused by twisting. Directinterband transitions between the valence and conduction bands are supposed.The generation rates of the electron orbital momentum is found. A kineticequation for an orbital momentum distribution function is formulated andsolved. The mean electron orbital momentum is found.

Orbital momentum excitation by interband optical transitions in a 2D system illuminated by twisted light