Integer and Fractional Quantum Hall Effect in a Strip of Stripes

TL;DR

This paper models electron behavior in a stripe-based quantum Hall system, revealing how stripe arrangements influence integer and fractional filling factors, edge states, and Hall conductance.

Contribution

It introduces a stripe model with periodic structures that explains the emergence of various quantum Hall states and their conductance properties.

Findings

Charge and spin density waves form within stripes.

Hall conductance matches filling factor ^2/h for all states.

Stripe distribution determines even or odd denominator filling factors.

Abstract

We study anisotropic stripe models of interacting electrons in the presence of magnetic fields in the quantum Hall regime with integer and fractional filling factors. The model consists of an infinite strip of finite width that contains periodically arranged stripes (forming supercells) to which the electrons are confined and between which they can hop with associated magnetic phases. The interacting electron system within the one-dimensional stripes are described by Luttinger liquids and shown to give rise to charge and spin density waves that lead to periodic structures within the stripe with a reciprocal wavevector 8k_F. This wavevector gives rise to Umklapp scattering and resonant scattering that results in gaps and chiral edge states at all known integer and fractional filling factors \nu. The integer and odd denominator filling factors arise for a uniform distribution of stripes, whereas the even denominator filling factors arise for a non-uniform stripe distribution. We calculate the Hall conductance via the Streda formula and show that it is given by \sigma_H=\nu e^2/h for all filling factors. We show that the composite fermion picture follows directly from the condition of the resonant Umklapp scattering.