Transport properties of a two-dimensional electron gas dressed by light

TL;DR

This paper theoretically demonstrates that a strong electromagnetic field can significantly alter the transport properties of a two-dimensional electron gas, enabling control over conductivity and localization effects.

Contribution

It introduces a theoretical framework showing how a high-frequency electromagnetic field can drastically modify 2DEG transport properties, including conductivity enhancement and localization suppression.

Findings

Conductivity can increase by thousands of percent due to the dressing field.

The conductivity exhibits oscillating dependence on the electromagnetic field intensity.

Weak localization of 2DEG is suppressed by the dressing electromagnetic field.

Abstract

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.