We report on the orientation and morphology of solid-state dewetting holes obtained from a kinetic Monte Carlo model with nearest neighbor and next nearest neighbor interactions on a cubic lattice. The morphologies found in simulations share strong similarities with those of diffusion-limited crystal growth: we find compact shapes, isotropic and anisotropic seaweed shapes, and dendritic shapes. Some of these shapes have been observed in solid-state dewetting experiments with various semi-conductors or metals on insulating substrates. The sides of the fingers can exhibit two types of zigzag instabilities with 90 or 45 degrees. Due to 4-fold symmetry, dewetting hole shapes are found to exhibit two possible orientations with fingers along the (110) or (100) directions. We find that the rotation transition from one orientation to the other can be observed in our model by varying anisotropy, temperature, or dewetting strength. The two orientations correspond respectively to experimental observations of dewetting for Silicon and Germanium on Insulator and to the dewetting of metal films with different reducing gas flow rate.

中文翻译：

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固态去湿孔的方向和形态

我们报告了从动力学蒙特卡洛模型获得的固态去湿孔的方向和形态，该模型具有立方晶格上最近的邻居和下一个最近的邻居相互作用。在模拟中发现的形态与扩散受限的晶体生长具有强烈的相似性：我们发现了紧凑的形状，各向同性和各向异性的海藻形状以及树枝状形状。在固态除湿实验中，在绝缘基板上使用各种半导体或金属观察到了其中一些形状。手指的侧面可能会出现两种90度或45度的锯齿形不稳定性。由于具有四重对称性，因此用手指沿（110）或（100）方向显示了两个润湿孔形状。我们发现，在我们的模型中，可以通过改变各向异性，温度或反湿强度来观察从一个方向到另一个方向的旋转过渡。这两个方向分别对应于在绝缘体上对硅和锗进行去湿的实验观察结果以及与具有不同还原气体流速的金属膜的去湿。