异质外延自组织锥形量子点长程相互作用对弹性应变场分布的影响

Effects of long-range interaction on elastic strain fields of hetero-epitaxial self-organized conical quantum dots

利用有限元法，在ANSYS环境下，利用二维模型对自组织应变外延异质结锥形量子点的应力应变分布情况进行了系统分析。分析过程分别考虑了孤立锥形量子点系统、单层多量子点系统以及量子点超晶格系统三种情况，结果表明，单层和超品格多量子点系统衬底之间存在的长程相互作用力对量子点及其周围的应力应变分布有显著影响。在计算应变对多量子点系统的电子结构的影响时，必须将多量子点之间的相互作用对应变的贡献考虑进去。

A systemic analysis about the elastic strain fields of conical shaped quantum dots is given in the finite element method by the ANSYS tool. In the analysis, isolated quantum dot, multi-quantum dot and superlattice quantum dot array systems were considered. Results showed the long-range elastic fields of the substrate between the quantum dots would influence the strain fields of the materials in and around the quantum dot. So, in calculation the electronic structure of the multi quantum dots, the strain influences must be considered as a whole.