Confinement of fractional quantum Hall states in narrow conducting channels
30 July 2007
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 2mm length but gated to near 0.3mm 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.
