Magneto-transport and divergent screening of driven two dimensional electron gas in high Landau levels

TL;DR

This paper predicts a divergence in Coulomb screening in a driven two-dimensional electron gas at high Landau levels, providing a theoretical explanation for zero-resistance states observed experimentally.

Contribution

It introduces a model combining long and short-range disorder effects to explain magneto-transport and screening divergence in driven 2D electron systems.

Findings

Divergence of Coulomb screening due to Ryzhii photocurrent.

Inverse relationship between long-range potential gradient and longitudinal conductivity.

Qualitative theory explaining zero-resistance states.

Abstract

In two dimensional electron system in magnetic fields such that the Fermi energy lies in high Landau levels and driven by microwave $ac$-field a divergence of the Coulomb screening due to the Ryzhii photocurrent is predicted. A model of magneto-transport with superposition of long range and short range disorders is introduced. In this model the larger is the gradient of the long range potential the smaller is the longitudinal conductivity/resistivity. As a consequence a qualitative theory of the recently discovered zero-resistance states is given.