Study of Island Formation in Epitaxially Strained Films on Unbounded Domains

Study of Island Formation in Epitaxially Strained Films on Unbounded Domains
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无界域上外延应变膜岛形成的研究

DOI:
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发表时间:
2014
期刊:
影响因子:
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通讯作者:
B. Zwicknagl
B. Zwicknagl
中科院分区:
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文献类型:
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作者:
P. Bella;M. Goldman;B. Zwicknagl

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我们考虑一个与无界区域上异质外延生长中岛的形成有关的变分模型。我们首先推导出的最小能量的缩放制度的薄膜的体积和晶体失配的振幅。对于小体积,不存在极小,然后证明。这对应于实验观察到的润湿效应。另一方面,我们证明了大体积极小的存在性。最后,我们研究了最优形状的渐近行为。
We consider a variational model related to the formation of islands in heteroepitaxial growth on unbounded domains. We first derive the scaling regimes of the minimal energy in terms of the volume of the film and the amplitude of the crystallographic misfit. For small volumes, non-existence of minimizers is then proven. This corresponds to the experimentally observed wetting effect. On the other hand, we show the existence of minimizers for large volumes. We finally study the asymptotic behavior of the optimal shapes.