Open AccessAnalysis of strain energy and relaxation degree in different-shaped quantum dots using finite element method
Author(s) -
Tianqi Wang,
Zhongyuan Yu,
Yumin Liu,
Pengfei Lu
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.5618
Subject(s) - quantum dot , strain (injury) , degree (music) , relaxation (psychology) , materials science , pyramid (geometry) , condensed matter physics , finite element method , strain energy , aspect ratio (aeronautics) , energy (signal processing) , physics , nanotechnology , optics , composite material , quantum mechanics , thermodynamics , medicine , psychology , social psychology , acoustics
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.