  We study the photogalvanic effect caused by a simultaneous action of
circular-polarized interband and linearly-polarized intraband illuminations. It
is found that, in such conditions, the steady photocurrent appears. The effect
originates from the valley-selective pumping by the circular light, the
trigonal asymmetry of the valleys together with the even asymmetry of the
linearly-polarized light, that produces a polar in-plane asymmetry of the
electron and hole distribution functions, leading to the photocurrent. The
approach is based on the solution of the classical kinetic equation for
carriers with accounting for the quantum interband excitation.
