D.C. Transport Measurements and the Direction of Propagation of Composite Fermion Edge States

TL;DR

This paper demonstrates that d.c. transport experiments on macroscopic Hall bars challenge Hartree models, indicating that composite fermion edge states predominantly propagate in the same direction as non-interacting electrons, contrary to some theoretical predictions.

Contribution

The study provides experimental evidence that constrains theoretical models of composite fermion edge state propagation, favoring models with co-propagating edge states.

Findings

Transport data contradicts Hartree models with counter-propagating edge states.

Edge states at the Fermi level predominantly propagate in the same direction as electrons.

Results support models with co-propagating composite fermion edge states.

Abstract

Simple and quite general considerations are used to show that the results of d.c. transport experiments on macroscopic Hall bars are inconsistent with Hartree models in which a majority of the branches of single-particle composite fermion edge states at the Fermi level propagate in the direction opposite to that in which non-interacting electrons travel along the edge.