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arXiv 1208.0964cond-mat.stat-mech
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二维Blume-Capel模型中润湿相变的Monte Carlo研究

Wetting Transition in the Two-Dimensional Blume-Capel Model: A Monte Carlo study

Ezequiel V. Albano, Kurt Binder

摘要:

通过对$L \times M$晶格的有限尺寸标度分析,研究了Blume-Capel模型的润湿转变,其中竞争边界场$\pm H_1$分别作用于条带中$L$行的第一行或最后一行.我们表明,使用适当的各向异性版本的有限尺寸缩放,在$d=2$临界润湿相当于一个“散装”的指数$α=-1$,$β=0$,和$γ=3$的临界现象。这些概念也验证了伊辛模型。对于布卢姆-卡佩尔模型,它被发现,发生临界润湿的场强$H_{1c} (T)$去零时,散装二级过渡接近,而$H_{1c}(T)$保持非零的区域中,在散装的一级过渡从有序相,与非零的自发磁化,无序相发生。共存相之间的界面,然后显示界面富集的无序相的层,其表现出在第二阶的情况下,只有一个有限的厚度。对三临界点附近润湿相图的标度行为也作了初步讨论。

英文摘要:

The wetting transition of the Blume-Capel model is studied by a finite-size scaling analysis of $L \times M$ lattices where competing boundary fields $\pm H_1$ act on the first row or last row of the $L$ rows in the strip, respectively. We show that using the appropriate anisotropic version of finite size scaling, critical wetting in $d=2$ is equivalent to a "bulk" critical phenomenon with exponents $α=-1$, $β=0$, and $γ=3$. These concepts are also verified for the Ising model. For the Blume-Capel model it is found that the field strength $H_{1c} (T)$ where critical wetting occurs goes to zero when the bulk second-order transition is approached, while $H_{1c}(T)$ stays nonzero in the region where in the bulk a first-order transition from the ordered phase, with nonzero spontaneous magnetization, to the disordered phase occurs. Interfaces between coexisting phases then show interfacial enrichment of a layer of the disordered phase which exhibits in the second order case a finite thickness only. A tentative discussion of the scaling behavior of the wetting phase diagram near the tricritical point also is given.

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