应变外延膜中形态不稳定性的非线性演化
Nonlinear evolution of a morphological instability in a strained epitaxial film
摘要：
沉积在可变形衬底上的应变外延膜经历形态不稳定性，通过表面扩散来松弛弹性能量。这种膜与润湿相互作用的非线性和非局部动力学方程推导和数值求解在二维和三维。在某一临界厚度以上，表面朝向由润湿层分隔的岛的阵列演变。岛的化学势随其体积减小，使系统经历一个不间断的粗化所描述的幂律与显着的尺寸依赖性。
英文摘要：
A strained epitaxial film deposited on a deformable substrate undergoes a morphological instability relaxing the elastic energy by surface diffusion. The nonlinear and nonlocal dynamical equations of such films with wetting interactions are derived and solved numerically in two and three dimensions. Above some critical thickness, the surface evolves towards an array of islands separated by a wetting layer. The island chemical potential decreases with its volume, so that the system experiences a non-interrupted coarsening described by power laws with a marked dimension dependence.
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