Intrinsic gap of the ν=5/2 fractional quantum hall state

C. R. Dean, B. A. Piot, P. Hayden, S. Das Sarma, G. Gervais, L. N. Pfeiffer, K. W. West

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The fractional quantum Hall effect is observed at low magnetic field where the cyclotron energy is smaller than the Coulomb interaction energy. The ν=52 excitation gap at 2.63 T is measured to be 262±15mK, similar to values obtained in samples with twice the electronic density. Examining the role of disorder on the 52 state, we find that a large discrepancy remains between theory and experiment for the intrinsic gap extrapolated from the infinite mobility limit. The observation of a 52 state in the low-field regime suggests that inclusion of nonperturbative Landau level mixing may be necessary to fully understand the energetics of half-filled fractional quantum Hall liquids.

Original languageEnglish (US)
Article number146803
JournalPhysical review letters
Issue number14
StatePublished - Apr 10 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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