Temperature-dependent magnetotransport around ν=1/2 in ZnO heterostructures.


The sequence of prominent fractional quantum Hall states up to ν=5/11 around ν=1/2 in a high-mobility two-dimensional electron system confined at oxide heterointerface (ZnO) is analyzed in terms of the composite fermion model. The temperature dependence of R(xx) oscillations around ν=1/2 yields an estimation of the composite fermion effective mass, which increases linearly with the magnetic field. This mass is of similar value to an enhanced electron effective mass, which in itself arises from strong electron interaction. The energy gaps of fractional states and the temperature dependence of R(xx) at ν=1/2 point to large residual interactions between composite fermions.

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@article{Maryenko2012TemperaturedependentMA, title={Temperature-dependent magnetotransport around ν=1/2 in ZnO heterostructures.}, author={Denis Maryenko and Joseph Falson and Yusuke Kozuka and Atsushi Tsukazaki and Masaru Onoda and Hiroshi Aoki and Masashi Kawasaki}, journal={Physical review letters}, year={2012}, volume={108 18}, pages={186803} }