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

Details Temperature dependent magnetotransport around $ν$= 1/2 in ZnO heterostructures Temperature dependent magnetotransport around $ν$= 1/2 in ZnO heterostructures

2012-03-15

arxiv.org/abs/1203.3349v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 Figures

Scientific paper

The sequence of prominent fractional quantum Hall states up to $\nu$=5/11 around $\nu$=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 $\Rxx$ oscillations around $\nu$=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 $\Rxx$ at $\nu$=1/2 point to large residual interactions between composite fermions.

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