Manifestation of a complex edge excitation structure in the fractional quantum Hall regime at high filling factors

TL;DR

This paper investigates complex edge excitation structures in the fractional quantum Hall regime at high filling factors, revealing incomplete equilibration and a mobility gap, thus advancing understanding of edge physics in strongly correlated systems.

Contribution

It provides experimental evidence of complex edge excitation structures and incomplete equilibration at high fractional filling factors 4/3 and 5/3, highlighting novel edge phenomena.

Findings

Incomplete equilibration observed at high fractional filling factors

Manifestation of complex edge excitation structures

Determination of mobility gap in the $ u_c=1$ incompressible strip

Abstract

We experimentally study equilibration across the sample edge at high fractional filling factors 4/3, 5/3 under experimental conditions, which allow us to obtain high imbalance conditions. We find a lack of the full equilibration across the edge even in the flat-band situation, where no potential barrier survives at the sample edge. We interpret this result as the manifestation of complicated edge excitation structure at high fractional filling factors 4/3, 5/3. Also, a mobility gap in the $\nu_c=1$ incompressible strip is determined in normal and tilted magnetic fields.