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arXiv 1306.0347cond-mat.stat-mech
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无限级和连续变化级润湿跃迁的重整化群计算。I.局部界面哈密顿方法

Renormalization group calculations for wetting transitions of infinite order and continuously varying order. I. Local interface Hamiltonian approach

J. O. Indekeu, K. Koga, H. Hooyberghs, A. O. Parry

摘要:

我们研究的润湿相变的无限顺序和连续变化的顺序,最近发现在一个平均场密度泛函模型的三相平衡系统与短程力和两个组件的序参量的热波动的影响。使用线性泛函重整化群(RG)计算内的局部界面哈密顿方法,我们表明,无限阶跃迁是强大的。指数奇异性(意味着$2-α_s = \infty$)的表面自由能过剩在无限阶润湿以及精确的代数发散(与$β_s = -1$)的润湿层厚度不修改,只要$ω< 2$,与$ω$的无量纲润湿参数,测量热波动的强度。界面宽度在代数上和通用上发散(使用$ν_{\perp} = 1/2$)。相比之下,非通用的临界润湿过渡有限,但连续变化的顺序进行修改时,考虑到热波动,在显示弱,中间和强波动制度的类似模型的早期计算的预测。

英文摘要:

We study the effect of thermal fluctuations on the wetting phase transitions of infinite order and of continuously varying order, recently discovered within a mean-field density-functional model for three-phase equilibria in systems with short-range forces and a two-component order parameter. Using linear functional renormalization group (RG) calculations within a local interface Hamiltonian approach, we show that the infinite-order transitions are robust. The exponential singularity (implying $2-α_s = \infty$) of the surface free energy excess at infinite-order wetting as well as the precise algebraic divergence (with $β_s = -1$) of the wetting layer thickness are not modified as long as $ω< 2$, with $ω$ the dimensionless wetting parameter that measures the strength of thermal fluctuations. The interface width diverges algebraically and universally (with $ν_{\perp} = 1/2$). In contrast, the non-universal critical wetting transitions of finite but continuously varying order are modified when thermal fluctuations are taken into account, in line with predictions from earlier calculations on similar models displaying weak, intermediate and strong fluctuation regimes.

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