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arXiv 0801.3598cond-mat.stat-mech
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场论中的界面粗糙化

Interfacial roughening in field theory

Michael H. Köpf, Gernot Münster

摘要:

在粗糙阶段,分离统计系统不同阶段的界面的宽度随系统尺寸的增加而增加。这种现象通常用毛细波模型来描述,该模型处理波动的、无限薄的膜,需要在动量空间中进行特别的截断。我们在单圈近似下,在Landau-Ginzburg模型即重整化场论的框架下,从第一性原理出发研究了界面粗糙化问题。界面轮廓和宽度的解析计算,产生具有确定系数的有限表达式。它们在标度区域是有效的,并且依赖于已知的重整化耦合常数。

英文摘要:

In the rough phase, the width of interfaces separating different phases of statistical systems increases logarithmically with the system size. This phenomenon is commonly described in terms of the capillary wave model, which deals with fluctuating, infinitely thin membranes, requiring ad hoc cut-offs in momentum space. We investigate the interface roughening from first principles in the framework of the Landau-Ginzburg model, that is renormalized field theory, in the one-loop approximation. The interface profile and width are calculated analytically, resulting in finite expressions with definite coefficients. They are valid in the scaling region and depend on the known renormalized coupling constant.

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