Coarsening and saturation of quantum dot arrays in heteroepitaxial strained films

Details Coarsening and saturation of quantum dot arrays in heteroepitaxial strained films Coarsening and saturation of quantum dot arrays in heteroepitaxial strained films

2011-04-06

arxiv.org/abs/1104.1121v1

Physics

Condensed Matter

Materials Science

14 pages, 7 figures; submitted to Phys. Rev. B

Scientific paper

The self-organization process during strained film heteroepitaxy is investigated via the development of a continuum elasticity model and the resulting nonlinear dynamic equation governing the evolution of film morphological profile. We study the formation and evolution of three-dimensional strained islands or quantum dots for different film-substrate misfit strains, in particular the phenomenon of island coarsening and saturation, via analyzing the time-dependent behavior of the structure factor for film surface height, its moments, and the surface roughness. Three regimes of island array evolution have been identified, including a film instability regime at early stage, a nonlinear coarsening regime at intermediate times, and the crossover to a saturated asymptotic state, with detailed behavior depending on misfit strains but not qualitatively on finite system sizes. Such asymptotic behavior of island saturation, which corresponds to the formation of steady but non-ordered arrays of strained quantum dots, occurs at later time for smaller misfit strain, and is found to be the effect of the nonlinear contribution of film elastic energy. The results are compared to previous experimental and theoretical studies on quantum dots coarsening and saturation.

Affiliated with

Also associated with

No associations

Rating

Coarsening and saturation of quantum dot arrays in heteroepitaxial strained films does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Coarsening and saturation of quantum dot arrays in heteroepitaxial strained films, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coarsening and saturation of quantum dot arrays in heteroepitaxial strained films will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-418199