Magnetoresistance of composite fermions at ν=1/2

Abstract

We have studied temperature dependence of both diagonal and Hall resistivity in the vicinity of $\nu =1/2$. Magnetoresistance was found to be positive and almost independent of temperature: temperature enters resistivity as a logarithmic correction. At the same time, no measurable corrections to the Hall resistivity has been found. Neither of these results can be explained within the mean-field theory of composite fermions by an analogy with conventional low-field interaction theory. There is an indication that interactions of composite fermions with fluctuations of the gauge field may reconcile the theory and experiment.

9 pages, 4 figures

References in corpus (2)

• Localization of Charged Quantum Particles in a Static Random Magnetic Field
• Logarithmic Temperature Dependence of Conductivity at Half Filled Landau Level

Cited by in corpus (5)

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• High temperature resistivity measured at ν = 5/2 as a predictor of 2DEG quality in the N=1 Landau level