  Considering the quantum dynamics of 2DEG exposed to both a stationary
magnetic field and an intense high-frequency electromagnetic wave, we found
that the wave decreases the scattering-induced broadening of Landau levels.
Therefore, various magnetoelectronic properties of two-dimensional
nanostructures (density of electronic states at Landau levels,
magnetotransport, etc) are sensitive to the irradiation by light. Thus, the
elaborated theory paves a way to optical controlling magnetic properties of
2DEG.
