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  • Title: Anomalous robustness of the ν=5/2 fractional quantum Hall state near a sharp phase boundary.
    Author: Liu Y, Kamburov D, Shayegan M, Pfeiffer LN, West KW, Baldwin KW.
    Journal: Phys Rev Lett; 2011 Oct 21; 107(17):176805. PubMed ID: 22107557.
    Abstract:
    We report magnetotransport measurements in wide GaAs quantum wells with a tunable density to probe the stability of the fractional quantum Hall effect at a filling factor of ν=5/2 in the vicinity of the crossing between Landau levels (LLs) belonging to the different (symmetric and antisymmetric) electric subbands. When the Fermi energy (E(F)) lies in the excited-state LL of the symmetric subband, the 5/2 quantum Hall state is surprisingly stable and gets even stronger near this crossing, and then suddenly disappears and turns into a metallic state once E(F) moves to the ground-state LL of the antisymmetric subband. The sharpness of this disappearance suggests a first-order transition.
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