论文标题
de gennes变窄以及自组织离子束纳米图中的结构与动态之间的关系
de Gennes Narrowing and the Relationship Between Structure and Dynamics in Self-Organized Ion Beam Nanopatterning
论文作者
论文摘要
研究结构与动态过程之间的关系是凝结物理物理学的核心目标。两者之间最引人注目的关系也许是De Gennes的现象变窄，其中液体中的放松时间与散射结构因子成正比。在这里，使用相干X射线散射在硅的自组织离子束纳米图案中发现了类似的关系。然而，与经典de Gennes狭窄中波动的指数松弛相反，动态表面表现出广泛的行为，随着长度尺度的函数，在长度上具有压缩的指数放松，该长度与显性的结构基序相对应 - 自组织的纳米级旋转。这些行为在描述表面演化的非线性模型的模拟中复制。我们建议这里观察到的压缩指数行为是由于在离子束纳米图中形成和进化的自组织表面纹章模式的形态持久性。
Investigating the relationship between structure and dynamical processes is a central goal in condensed matter physics. Perhaps the most noted relationship between the two is the phenomenon of de Gennes narrowing, in which relaxation times in liquids are proportional to the scattering structure factor. Here a similar relationship is discovered during the self-organized ion beam nanopatterning of silicon using coherent x-ray scattering. However, in contrast to the exponential relaxation of fluctuations in classic de Gennes narrowing, the dynamic surface exhibits a wide range of behaviors as a function of length scale, with a compressed exponential relaxation at lengths corresponding to the dominant structural motif - self-organized nanoscale ripples. These behaviors are reproduced in simulations of a nonlinear model describing the surface evolution. We suggest that the compressed exponential behavior observed here is due to the morphological persistence of the self-organized surface ripple patterns which form and evolve during ion beam nanopatterning.
