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arXiv 0907.4243cond-mat.stat-mech
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修正XY模型中的有限尺寸标度和一级相变

Finite size scaling and first order phase transition in a modified XY-model

Suman Sinha, Soumen Kumar Roy

摘要:

在Domany等人提出的二维修正XY模型中进行了蒙特卡罗模拟。al [E. Domany,M. Schick和R. H. Swendsen,Phys. Rev. Lett. 52,1535(1984)]。采用Wolff聚类算法,并进行多次直方图重加权。比热、序参量磁化率和自由能垒等物理量的一阶标度行为被精确地遵守。当发现最低阶关联函数在刚好高于转变的长距离处衰减到零时,下一个更高阶关联函数示出非零平台。

英文摘要:

Monte Carlo simulation has been performed in a two-dimensional modified XY-model first proposed by Domany et. al [E. Domany, M. Schick and R. H. Swendsen, Phys. Rev. Lett. 52, 1535 (1984)]. The cluster algorithm of Wolff has been used and multiple histogram reweighting is performed. The first order scaling behavior of the quantities like specific heat, order parameter susceptibility and free energy barrier are found to be obeyed accurately. While the lowest order correlation function was found to decay to zero at long distance just above the transition, the next higher order correlation function shows a non-zero plateau.

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