Observation of reentrant quantum Hall states in the lowest Landau level

Details Observation of reentrant quantum Hall states in the lowest Landau level Observation of reentrant quantum Hall states in the lowest Landau level

2011-11-23

arxiv.org/abs/1111.5384v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

Measurements in very low disorder two-dimensional electrons confined to relatively wide GaAs quantum well samples with tunable density reveal reentrant $\nu=1$ integer quantum Hall states in the lowest Landau level near filling factors $\nu=4/5$ and 6/5. These states are not seen at low densities and become more prominent with increasing density and in wider wells. Our data suggest a close competition between different types of Wigner crystal states near these fillings. We also observe an intriguing disappearance and reemergence of the $\nu=4/5$ fractional quantum Hall effect with increasing density.

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