Bistability of bilayer islands under anisotropic misfit stress

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• 作者：Jé ; rô ; me Colin ^{jerome.colin@univ-poitiers.fr}
• 关键词：Elasticity ; Island ; Shape instability ; Anisotropic stress ; Line energy
• 刊名：Surface Science
• 出版年：2012
• 期刊代码：104_00396028
• 类别：ch
• 出版时间：May, 2012
• 卷：606
• 期：9-10
• 页码：825-829
• 文件大小：573 K

摘要

The equilibrium shapes of bilayer islands under anisotropic misfit stress have been theoretically characterized from a thermodynamics point of view. Based on an energy variation calculation, it is found that when the ratio 蟽 between the components of the misfit stress is such that 蟽 = 鈭?#xA0;1, both square and rectangular shaped bilayer islands may coexist depending on the island volume and stress level. When 蟽 鈮?#xA0;鈭?#xA0;1 and 蟽 < 0, the possibility of formation rectangular islands along both perpendicular directions is also discussed.