Abstract
We have observed features in the magnetoresistance of a wide parabolic quantum well in the presence of the in-plane magnetic field at field three times larger than fundamental field corresponding to the depopulation of the last Landau level. The magnetoresistance structures shift with a specific sample parameter, such as potential width. We suggested the formation of correlated states of a three-dimensional electron gas at Landau filling factor 1/3, in analogy with a two-dimensional fractional quantum Hall effect.
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