Anomalous Negative Magnetoresistance Caused by Non-Markovian Effects

Details Anomalous Negative Magnetoresistance Caused by Non-Markovian Effects Anomalous Negative Magnetoresistance Caused by Non-Markovian Effects

2003-03-28

arxiv.org/abs/cond-mat/0303616v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages RevTeX, 5 figures

Scientific paper

10.1103/PhysRevB.68.201304

A theory of recently discovered anomalous low-field magnetoresistance is developed for the system of two-dimensional electrons scattered by hard disks of radius $a,$ randomly distributed with concentration $n.$ For small magnetic fields the magentoresistance is found to be parabolic and inversely proportional to the gas parameter, $ \delta \rho_{xx}/\rho \sim - (\omega_c \tau)^2 / n a^2.$ With increasing field the magnetoresistance becomes linear $\delta \rho_{xx}/\rho \sim - \omega_c \tau $ in a good agreement with the experiment and numerical simulations.

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