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27 January 2021
 
  » arxiv » cond-mat/0303616

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Anomalous Negative Magnetoresistance Caused by Non-Markovian Effects
Vadim V. Cheianov ; A.P. Dmitriev ; V.Yu. Kachorovskii ;
Date 28 Mar 2003
Subject Mesoscopic Systems and Quantum Hall Effect | cond-mat.mes-hall
AbstractA 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 ho_{xx}/ ho sim - (omega_c au)^2 / n a^2.$ With increasing field the magnetoresistance becomes linear $delta ho_{xx}/ ho sim - omega_c au $ in a good agreement with the experiment and numerical simulations.
Source arXiv, cond-mat/0303616
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