Evidence for developing fractional quantum hall states at even denominator 1/2 and 1/4 fillings in asymmetric wide quantum wells

J. Shabani, T. Gokmen, Y. T. Chiu, M. Shayegan

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Abstract

We report the observation of developing fractional quantum Hall states at Landau level filling factors ν=1/2 and 1/4 in electron systems confined to wide GaAs quantum wells with significantly asymmetric charge distributions. The very large electric subband separation and the highly asymmetric charge distribution at which we observe these quantum Hall states, together with the fact that they disappear when the charge distribution is made symmetric, suggest that these are one-component states, possibly described by the Moore-Read Pfaffian wave function.

Original languageEnglish (US)
Article number256802
JournalPhysical review letters
Volume103
Issue number25
DOIs
StatePublished - Dec 17 2009

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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