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  • Title: Nonconventional odd-denominator fractional quantum Hall states in the second Landau level.
    Author: Kumar A, Csáthy GA, Manfra MJ, Pfeiffer LN, West KW.
    Journal: Phys Rev Lett; 2010 Dec 10; 105(24):246808. PubMed ID: 21231551.
    Abstract:
    We report the observation of a new fractional quantum Hall state in the second Landau level of a two-dimensional electron gas at the Landau level filling factor ν=2+6/13. We find that the model of noninteracting composite fermions can explain the magnitude of gaps of the prominent 2+1/3 and 2+2/3 states. The same model fails, however, to account for the gaps of the 2+2/5 and the newly observed 2+6/13 states suggesting that these two states are of exotic origin.
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