arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2103.07761cond-mat.stat-mech
收藏

守恒表面粗糙化的固定$d$重整化群分析

Fixed $d$ Renormalization Group Analysis of Conserved Surface Roughening

V. Skultety, J. Honkonen

摘要:

守恒表面粗糙化代表了界面动力学的一种特殊情况,其中界面的总高度是守恒的。最近,有人建议[F。Caballero等人,物理修订版信函121,020601(2018)],称为“守恒Kardar-Parisi-Zhang”(CKPZ)方程的原始连续模型是不完整的,因为$d > 1$中的任何对称性都不禁止额外的非线性。在这项工作中,我们进行详细的场论重整化群(RG)分析的一般随机模型描述保守的表面粗糙化。系统的功率计数揭示了额外的边际相互作用在上临界尺寸,这也出现在分子束外延的上下文中。根据表面粒子的流动性的起源,所得到的模型显示了两个不同的标度制度;如果粒子移动主要是由于重力,领先的色散定律是$ω\sim k^2$,和平均场近似描述一个平坦的界面是准确的,在任何空间维度。另一方面,如果粒子的移动主要是由于表面曲率,界面变得粗糙的平均场色散定律$ω\sim k^4$,和修正的标度指数必须考虑。我们发现,后者的模型包括两个子类的模型,在所有订单的扰动理论解耦。此外,我们的RG分析的一般模型表明,通用的缩放是由一个粗糙的接口比CKPZ通用类。在固定的$d$和$\varepsilon$ -展开格式中,在单圈近似下导出了普适指数,并讨论了它们之间的关系。我们指出了这两个方案背后的所有重要细节,这些细节在文献中经常被忽视,它们的误解可能导致不一致的结果。

英文摘要:

Conserved surface roughening represents a special case of interface dynamics where the total height of the interface is conserved. Recently, it was suggested [F. Caballero et al., Phys. Rev. Lett. 121, 020601 (2018)] that the original continuum model known as `Conserved Kardar-Parisi-Zhang'(CKPZ) equation is incomplete, as additional non-linearity is not forbidden by any symmetry in $d > 1$. In this work, we perform detailed field-theoretic renormalization group (RG) analysis of a general stochastic model describing conserved surface roughening. Systematic power counting reveals additional marginal interaction at the upper critical dimension, which appears also in the context of molecular beam epitaxy. Depending on the origin of the surface particle's mobility, the resulting model shows two different scaling regimes; If the particles move mainly due to the gravity, the leading dispersion law is $ω\sim k^2$, and the mean-field approximation describing a flat interface is exact in any spatial dimension. On the other hand, if the particles move mainly due to the surface curvature, the interface becomes rough with the mean-field dispersion law $ω\sim k^4$ , and the corrections to scaling exponents must be taken into account. We show, that the latter model consist of two sub-class of models that are decoupled in all orders of perturbation theory. Moreover, our RG analysis of the general model reveals that the universal scaling is described by a rougher interface than CKPZ universality class. The universal exponents are derived within the one-loop approximation in both fixed $d$ and $\varepsilon$-expansion schemes, and their relation is discussed. We point out all important details behind these two schemes which are often overlooked in the literature, and their misinterpretation might lead to inconsistent results.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑