Analysis of strain energy and relaxation degree in different-shaped quantum dots using finite element method

作者：Wang Tian Qi; Yu Zhong Yuan^*; Liu Yu Min; Lu Peng Fei

来源：Acta Physica Sinica, 2009, 58(8): 5618-5623.

• quantum dot
• relax degree

The distribution of strain energy and the strain relaxation degree as functions of the aspect ratio in different-shaped quantum dots were studied using finite element method. The impact on strain relaxation, originating from the shape and the inter-island distance, was also quantitatively analyzed. The results indicate that when ignoring the surface energy, the relaxation degree increases with the increase of the aspect ratio regardless of the shape, among which the truncated pyramid quantum dots tend to become steady earlier than others. With the increase of the inter-island distance, the strain energy in the dots decreases, especially in the cubic dots. A good reference is provided by the relaxation degree for controlling the shape of quantum dots.

• 出版日期2009-8
• 单位北京邮电大学