title: Observation of reentrant integer quantum Hall states in the lowest Landau level.
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.
authors.affiliation: Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA.
authors.forename: Yang
authors.initials: Y
authors.lastname: Liu
authors.forename: C G
authors.initials: CG
authors.lastname: Pappas
authors.forename: M
authors.initials: M
authors.lastname: Shayegan
authors.forename: L N
authors.initials: LN
authors.lastname: Pfeiffer
authors.forename: K W
authors.initials: KW
authors.lastname: West
authors.forename: K W
authors.initials: KW
authors.lastname: Baldwin