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  • Title: Observation of reentrant integer quantum Hall states in the lowest Landau level.
    Author: Liu Y, Pappas CG, Shayegan M, Pfeiffer LN, West KW, Baldwin KW.
    Journal: Phys Rev Lett; 2012 Jul 20; 109(3):036801. PubMed ID: 22861882.
    Abstract:
    Measurements on very low disorder two-dimensional electrons confined to relatively wide GaAs quantum well samples with tunable density reveal a close competition between the electron liquid and solid phases near the Landau level filling factor ν=1. As the density is raised, the fractional quantum Hall liquid at ν=4/5 suddenly disappears at a well-width dependent critical density, and then reappears at higher densities with insulating phases on its flanks. These insulating phases exhibit reentrant ν=1 integer quantum Hall effects and signal the formation of electron Wigner crystal states. Qualitatively similar phenomena are seen near ν=6/5.
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