Spin response of two-dimensional electrons to lateral electric field

Orientation of two-dimensional (2D) electron spins by a lateral electric field has been studied. The dispersion law is supposed to contain linear terms, caused by spin-orbital band splitting in an asymmetric quantum well. The coefficient of spin orientation in the stationary electric field is found. The mean electron spin is oriented along the sample plane perpendicular to the electric field. The interaction of alternating electric field with 2D-electron spins is studied. The transitions between different spin states are shown to result in the narrow absorption line. In the frequency range, corresponding to the transitions, they mix with 2D-plasmons, thus producing a new type of excitations, the spin-plasmon polariton. The problem of the excitation of spin-plasmon polaritons by the external filed is solved