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Surface properties at the Kosterlitz-Thouless transition

机译:Kosterlitz-Thouless转变的表面性质

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摘要

Monte Carlo simulations of the two-dimensional XY model are performed in a square geometry with free and mixed fixed-free boundary conditions. Using a Schwarz-Christoffel conformal mapping, we deduce the exponent eta of the order parameter correlation function and its surface equivalent eta(parallel to), at the Kosterlitz-Thouless transition temperature. The well-known value eta(T-KT) = 1/4 is easily recovered even with systems of relatively small sizes, since the shape effects are encoded in the conformal mapping. The exponent associated to the surface correlations is similarly obtained eta(1)(TKT) similar or equal to 0.54. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 28]
机译:二维XY模型的蒙特卡罗模拟是在具有自由边界和混合自由边界条件的正方形几何体中执行的。使用Schwarz-Christoffel共形映射,我们推导了在Kosterlitz-Thouless转变温度下,阶数参数相关函数的指数eta及其表面等效eta(平行)。即使形状较小的系统,也很容易恢复众所周知的值eta(T-KT)= 1/4,因为形状效应是在保形映射中编码的。类似地获得与表面相关性相关的指数eta(1)(TKT)相似或等于0.54。 (C)2002 Elsevier Science B.V.保留所有权利。 [参考:28]

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