Nonconventional odd-denominator fractional quantum Hall states in the second Landau level |
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Authors: | Kumar A Csáthy G A Manfra M J Pfeiffer L N West K W |
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Affiliation: | Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA. |
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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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