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Self-assembled quantum dots (QDs) are highly strained heterostructures. The lattice strain significantly modifies the electronic and optical properties of these devices. A universal behavior is observed in atomistic strain simulations (in terms of both strain magnitude and profile) of QDs with different shapes and materials. In this paper, this universal behavior is investigated by atomistic as well...
In this paper, we report a fast effective mass model for accurately calculating the bound states and optical transitions of self-assembled quantum dots. The model includes the atomistic strain effects, namely, the strain deformation of the band edges, and strain modification of the effective masses. The explicit inclusion of strain effects in the picture has significantly improved the effective mass...
Self-assembled quantum dots have improved the performance of many optoelectronic devices such as infrared photodetectors and intermediate band solar cells [1], [2]. They offer the ability to tune device parameters by carefully adjusting device dimensions. Designing an optimal quantum dot for a specific purpose requires intensive simulation beforehand to get an idea on the effect of various materials...
Self-assembled quantum dots are highly strained heterostructures, and a rigorous atomistic strain model is needed to predict the behavior of these devices. An anharmonic strain model reported by Lazarenkova, et al. [1] modifies the well-known harmonic Keating model [2] to include the effect of anharmonicity in the lattice potential. The Lazarenkova strain parameters were originally optimized to deliver...
Self-assembled quantum dots (QDs) realized by Stranski-Krastanov growth mode often demonstrate polarized transitions in quantized electron (hole) states and non-degeneracy in the first exicted state in various spectroscopic analyses. These observations confirm the presence of certain symmetry breaking/lowering mechanisms in these low dimensional QDs which cannot be represented accurately with continuum...
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