气相沉积聚合物薄膜生长中的反常标度行为
Anomalous Scaling Behavior in Polymer Thin Film Growth by Vapor Deposition
摘要：
作为第一步，了解异常动力学粗糙与多重分形在最近的实验中的气相沉积聚合（VDP）的增长，我们研究了一个简单的玩具模型的VDP增长（1+1）维晶格，随着单体扩散，聚合物成核，有限的活性端键合，和阴影效应。使用广泛的数值模拟，我们观察到，全球粗糙度指数是不同的地方。有人认为，VDP生长中的这种异常归因于聚合物活性末端的非局部阴影效应引起的不稳定性。通过改变余弦通量的扩散系数与沉积速率的比值，我们还讨论了扩散在聚合物薄膜生长中的动力学粗化中的作用，这与金属或半导体薄膜生长中的动力学粗化有很大不同。最后，我们建议它的（2+1）维版本，它可以直接与实验结果进行比较。
英文摘要：
As a first step to understand anomalous kinetic roughening with multifractality in recent experiments of the vapor deposition polymerization (VDP) growth, we study a simple toy model of the VDP growth in a (1+1)-dimensional lattice, along with monomer diffusion, polymer nucleation, limited active end bonding, and shadowing effects. Using extensive numerical simulations, we observe that the global roughness exponent is different from the local one. It is argued that such anomalies in VDP growth are attributed to the instability induced by the nonlocal shadowing effects on active ends of polymers. As varying the ratio of diffusion coefficient to the deposition rate by cosine flux, we also discuss the role of diffusion in kinetic roughening of the polymer thin film growth, which is quite different from that of the metal or semiconductor film growth. Finally, we suggest its (2+1)-dimensional version, which can be directly compared with experimental results.
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