Confinement of fractional quantum Hall states in narrow conducting channels

TL;DR

This paper demonstrates the confinement of fractional quantum Hall states in narrow channels, enabling quasiparticle manipulation crucial for interference experiments and potential non-Abelian statistics studies.

Contribution

It introduces a method to confine fractional quantum Hall states in narrow, gate-defined channels in high mobility heterostructures, advancing quasiparticle control.

Findings

Persistence of correlated state at filling fraction 5/3 in 2 micron channels

Confinement achieved in channels as narrow as 0.3 microns

Potential for quasiparticle interference device development

Abstract

Confinement of small-gapped fractional quantum Hall states facilitates quasiparticle manipulation and is an important step towards quasiparticle interference measurements. Demonstrated here is conduction through top gate defined, narrow channels in high density, ultra-high mobility heterostructures. Transport evidence for the persistence of a correlated state at filling fraction 5/3 is shown in channels of 2micron length but gated to near 0.3micron in width. The methods employed to achieve this confinement hold promise for interference devices proposed for studying potential non-Abelian statistics at filling fraction 5/2.