Observation of an anomalous density-dependent energy gap of the ν=5/2 fractional quantum Hall state in the low-density regime

N. Samkharadze, Dohyung Ro, L. N. Pfeiffer, K. W. West, G. A. Csáthy

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)

Abstract

We have studied the ν=5/2 fractional quantum Hall state in a density-tunable sample at extremely low electron densities. For the densities accessed in our experiment, the Landau level mixing parameter κ spans the 2.52<κ<2.82 range. In the vicinity of 5.8×1010cm-2 or κ=2.6 an anomalously large change in the density dependence of the energy gap is observed. Possible origins of such an anomaly are discussed, including a topological phase transition in the ν=5/2 fractional quantum Hall state.

Original languageEnglish
Article number085105
Number of pages6
JournalPhysical Review B
Volume96
Issue number8
DOIs
Publication statusPublished - 2017
Externally publishedYes

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