Anomalous robustness of the 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

doi:10.1103/PhysRevLett.107.176805

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

Mesoscale and Nanoscale Physics 2012-03-06 v3 Strongly Correlated Electrons

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

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Abstract

We report magneto-transport measurements in wide GaAs quantum wells with tunable density to probe the stability of the fractional quantum Hall effect at filling factor $\nu =$ 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.

Keywords

fractional quantum Hall effect 5/2 state phase boundary Landau level crossing GaAs quantum well first-order transition magneto-transport

Cite

@article{arxiv.1106.0089,
  title  = {Anomalous robustness of the 5/2 fractional quantum Hall state near a sharp phase boundary},
  author = {Yang Liu and D. Kamburov and M. Shayegan and L. N. Pfeiffer and K. W. West and K. W. Baldwin},
  journal= {arXiv preprint arXiv:1106.0089},
  year   = {2012}
}

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

Abstract

Keywords

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