Confinement of fractional quantum Hall states in narrow conducting channels

摘要

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