  We investigate the relevance of the spin-orit coupling to the far-infrared
absorption of two-dimensional semiconductor dots. Varying the strength of the
Dresselhaus term, a mechanism feasible in experiment by changing the dot width,
distinctive splittings of the Kohn peak as well as additional low energy modes
are predicted in a non-interacting model. Each mode has a spatial distribution
of charge, perpendicular and in-plane spin densities that correlate in a
peculiar way with the frequency and polarization of the external field. We
study the robustness of these features against electron-electron interactions
as well as the appearance of interaction-induced additional characteristics.
