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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2005

Intraband transitions in quantum dot-superlattice heterostructures

Résumé

We present a scheme of adjusting the mid-infrared absorption properties to desired energy transitions in quantum dot-based photodetectors by combining band gap engineering with the self-organized growth of quantum dots. Embedding the self-organized InAs quantum dots into an AlAs/GaAs superlattice enables us to tune the optical transition energy by changing the superlattice period as well as by changing the growth conditions of the dots. Using a one-band envelope function framework, we are able, in a three-dimensional calculation, to predict the absorption spectra of these devices as well as their polarization properties. These calculations further predict a strong impact of the dots on the superlattice minibands. By comparing aligned, periodic dot stacks with nonperiodic dot arrangements within the superlattice, we can experimentally confirm this prediction.
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Dates et versions

hal-00002225 , version 1 (19-07-2004)

Identifiants

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F.F. Schrey, L. Rebohle, T. Mueller, G. Strasser, K. Unterrainer, et al.. Intraband transitions in quantum dot-superlattice heterostructures. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2005, 72, pp.155310. ⟨hal-00002225⟩
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