Strongly interacting 2D electron systems: Evidence for enhanced 1D edge-channel coupling

TL;DR

This study provides evidence of enhanced one-dimensional edge-channel coupling in a strongly interacting two-dimensional electron system, revealing nearly vanishing Hall resistance and layer-specific quantum state interactions.

Contribution

It demonstrates the existence of enhanced 1D edge-channel coupling and excitonic correlations in a 2D bilayer system with a narrow barrier, advancing understanding of quantum interactions.

Findings

Nearly vanishing Hall resistances at integer filling factors

Filling factor dependent equilibration lengths indicating enhanced 1D coupling

Confirmation of layer-specific quantum state coupling via electron drag measurements

Abstract

We observe nearly vanishing Hall resistances for integer filling factors in a counterflow (CF) experiment on a density balanced 2D bilayer system. Filling factor dependent equilibration lengths demonstrate enhanced 1D coupling via edge-channels. Due to the narrow barrier the edge-modes of the two 2DEGs are in close proximity allowing for 1D excitonic correlations. Electron drag measurements confirm the observed quantum state selective coupling between the layers.