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Numerical simulations of a two-dimensional lattice grain boundary model

机译:二维晶格晶界模型的数值模拟

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We present detailed Monte Carlo results for a two-dimensional grain boundary model on a lattice. The effective Hamiltonian of the system results from the microscopic interaction of grains with orientations described by spins of unit length, and leads to a nearest-neighbour interaction proportional to the absolute value of the angle between the grains. Our analysis of the correlation length xi and susceptibility chi in the high-temperature phase favour a Kosterlitz-Thouless-like (KT) similarity over a second-order phase transition. Unconstrained KT fits of chi and xi confirm the predicted value for the critical exponent nu, while the values of eta deviate from the theoretical prediction. Additionally, we apply finite-size scaling theory and investigate the question of multiplicative logarithmic corrections to a KT transition. As for the critical exponents, our results are similar to data obtained from the XY model, so that both models probably lie in the same universality class. (C) 1998 Elsevier Science B.V. All rights reserved. [References: 21]
机译:我们为格子上的二维晶粒边界模型提供详细的蒙特卡洛结果。该系统的有效哈密顿量是由于晶粒的微观相互作用和单位长度的自旋所描述的取向而产生的,并导致与晶粒之间夹角的绝对值成比例的最近邻相互作用。我们对高温相中的相关长度xi和磁化率chi的分析在二阶相变上倾向于Kosterlitz-Thouless-like(KT)相似性。 chi和xi的无约束KT拟合确定了临界指数nu的预测值,而eta的值则偏离了理论预测。此外,我们应用了有限尺寸缩放理论,并研究了KT转换的对数乘法对数校正问题。至于关键指数,我们的结果类似于从XY模型获得的数据,因此这两个模型可能位于同一通用性类别中。 (C)1998 Elsevier Science B.V.保留所有权利。 [参考:21]

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