Model of a realistic InP surface quantum dot extrapolated from atomic force microscopy results

We report on numerical simulations of a zincblende InP surface quantum dot (QD) on ##IMG## [http://ift.tt/1jUUW8h] {$\text{I}{{\text{n}}_{0.48}}\text{G}{{\text{a}}_{0.52}}\text{P}$} buffer. Our model is strictly based on experimental structures, since we extrapolated a three-dimensional dot directly by atomic force microscopy results. Continuum electromechanical, ##IMG## [http://ift.tt/1jUUWoz] {$\vec{k}\;\cdot \;\vec{p}$} bandstructure and optical calculations are presented for this realistic structure, together with benchmark calculations for a lens-shape QD with the same radius and height of the extrapolated dot. Interesting similarities and differences are shown by comparing the results obtained with the two different structures, leading to the conclusion that the use of a more realistic structure can provide significant improvements in the modelin...

Daniele Barettin, Roberta De Angelis, Paolo Prosposito, Matthias Auf der Maur, Mauro Casalboni and Alessandro Pecchia

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