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Advances in Condensed Matter Physics
Volume 2014, Article ID 423693, 10 pages
http://dx.doi.org/10.1155/2014/423693
Research Article

Field Induced Memory Effects in Random Nematics

1Faculty of Natural Sciences and Mathematics, University of Maribor, Koroška 160, 2000 Maribor, Slovenia
2Condensed Matter Physics Department, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
3Division of Mathematical Sciences, University of Southampton, Southampton SO17 1BJ, UK

Received 4 August 2014; Accepted 15 October 2014; Published 30 November 2014

Academic Editor: Aleš Iglič

Copyright © 2014 Amid Ranjkesh et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We studied numerically external field induced memory effects in randomly perturbed nematic liquid crystals. Random anisotropy nematic-type lattice model was used. The impurities imposing orientational disorder were randomly spatially distributed with the concentration below the percolation threshold. Simulations were carried for finite temperatures, where we varied , interaction strength between LC molecules, and impurities and external field . In the plane we determined lines separating short range—quasi long range and quasi long range—long range order. Furthermore, crossover regime separating external field and random field dominated regime was estimated. We calculated remanent nematic ordering in samples at as a function of the previously experienced external field strength .