Early stage domain coarsening of the isotropic-nematic phase transition
Early stage domain coarsening of the isotropic-nematic phase transition
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DOI：
10.1063/1.3609102
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发表时间：
2011-07-14
影响因子：
4.4
通讯作者：
Zumer, S.
中科院分区：
文献类型：
--
作者：
Bradac, Z.;Kralj, Samo;Zumer, S.
数值研究了温度驱动的各向同性液晶（I-N）相变的早期畴粗化动力学。在三维空间中研究了一类通过改进的Lebwohl-Lasher两两相互作用相互作用的棒状物体系统。粗化动力学采用布朗分子动力学。为了消除格点几何强迫现象，允许格点的盒限制涨落。我们分析了序参量增长和畴粗化的早期制度的I-N相变作为淬火速率的函数。我们发现，不久后的过渡双峰分布的域出现，较短的分支逐渐消失。该系统的行为符合Kibble-Zurek机制的预测，该机制最初被引入早期宇宙的模型条件。(C)2011年美国物理学会。[doi：10.1063/1.3609102]
We study numerically the early stage domain coarsening dynamics of the temperature driven isotropic-nematic (I-N) liquid crystal phase transition. System of rod like objects which interact via the modified Lebwohl-Lasher pairwise interaction is considered in 3D. The coarsening dynamics is followed using Brownian molecular dynamics. The box-restricted lattice point fluctuations are allowed in order to get rid of lattice geometry enforced phenomena. We analyze order parameter growth and domain coarsening in the early regime of the I-N phase transition as a function of the quench rate. We show that soon after the transition bimodal distribution of domains appears, where the shorter branch gradually vanishes. The behavior of the system is in accordance with predictions of the Kibble-Zurek mechanism which was originally introduced to model conditions in the early universe. (C) 2011 American Institute of Physics. [doi:10.1063/1.3609102]