  We show theoretically that the strong interaction of a two-dimensional
electron gas (2DEG) with a dressing electromagnetic field drastically changes
its transport properties. Particularly, the dressing field leads to the giant
increase of conductivity (which can reach thousands of percents), results in
nontrivial oscillating dependence of conductivity on the field intensity, and
suppresses the weak localization of 2DEG. As a consequence, the developed
theory opens an unexplored way to control transport properties of 2DEG by a
strong high-frequency electromagnetic field. From experimental viewpoint, this
theory is applicable directly to quantum wells exposed to a laser-generated
electromagnetic wave.
