Anomalous robustness of the ν=5/2 fractional quantum Hall state near a sharp phase boundary

Yang Liu, D. Kamburov, M. Shayegan, L. N. Pfeiffer, K. W. West, K. W. Baldwin

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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 (EF) 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 EF moves to the ground-state LL of the antisymmetric subband. The sharpness of this disappearance suggests a first-order transition.

Original languageEnglish (US)
Article number176805
JournalPhysical review letters
Volume107
Issue number17
DOIs
StatePublished - Oct 17 2011

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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