Magnetoresistance of composite fermions at ν=1/2

Details Magnetoresistance of composite fermions at ν=1/2 Magnetoresistance of composite fermions at ν=1/2

1997-04-05

arxiv.org/abs/cond-mat/9704043v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 4 figures

Scientific paper

10.1103/PhysRevB.56.R1672

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.

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