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arXiv 1902.03211cond-mat.stat-mech
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动力学势垒对有限迁移率界面生长模型的影响

Effects of a kinetic barrier on limited-mobility interface growth models

Anderson J. Pereira, Sidiney G. Alves, Silvio C. Ferreira

摘要:

在Wolf-Villain和Das Sarma-Tamborenea模型中研究了在[Leal \textit{et al.},\href{https://doi.org/10.1088/0953-8984/23/29/292201}{J. Phys. Condens. Matter \textbf{23}, 292201 (2011)} ]中引入的面外阶边扩散的动力学势垒所起的作用。使用大规模的模拟,我们观察到,这个障碍是足以产生增长的不稳定性,形成准规则丘在一个和两个维度。特征表面长度迅速饱和,指示3d结构的不相关生长,这也由生长指数$β=1/2$证实。面外粒子流提供了向下通量的大幅减少,从而增强了净向上扩散和3d自排列结构的形成。

英文摘要:

The role played by a kinetic barrier originated by out-of-plane step edge diffusion, introduced in [Leal \textit{et al.}, \href{https://doi.org/10.1088/0953-8984/23/29/292201}{J. Phys. Condens. Matter \textbf{23}, 292201 (2011)}], is investigated in the Wolf-Villain and Das Sarma-Tamborenea models with short range diffusion. Using large-scale simulations, we observed that this barrier is sufficient to produce growth instability, forming quasiregular mounds in one and two dimensions. The characteristic surface length saturates quickly indicating a uncorrelated growth of the 3d structures, which is also confirmed by a growth exponent $β=1/2$. The out-of-plane particle current provides a large reduction of the downward flux enhancing, consequently, the net upward diffusion and formation of 3d self-arranged structures.

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