A self-consistent microscopic model of Coulomb interaction in a bilayer system as an origin of Drag Effect Phenomenon

TL;DR

This paper presents a self-consistent microscopic model incorporating Coulomb interactions and local conductivity to explain magneto-transport phenomena like the Drag Effect in bilayer electron systems, emphasizing poor screening and interlayer interactions.

Contribution

It introduces a novel self-consistent Thomas-Fermi model that accounts for Coulomb interactions and screening effects to describe the Drag Phenomenon in bilayer systems.

Findings

Poor screening within incompressible strips affects interlayer Coulomb interaction.

Applied current causes tilting of Landau levels and Hall potential.

Model's predictions depend on current, temperature, magnetic field, and layer density.

Abstract

In this work we implement the self-consistent Thomas-Fermi model that also incorporates a local conductivity model to an electron-electron bilayer system, in order to describe novel magneto-transport properties such as the Drag Phenomenon. The model can successfully account for the poor screening of the potential within the incompressible strips and its impact on the interlayer Coulomb interaction. An externally applied current in the active layer results in the tilting of the Landau levels and built-up of a Hall potential across the layer, which, in turn, induces a tilted potential profile in the passive layer as well. We investigate the effect of the current intensity, temperature, magnetic field, and unequal density of layers on the self-consistent density and potential profiles of the bilayer system.