Physics – Condensed Matter – Materials Science
Scientific paper
2008-11-10
Physics
Condensed Matter
Materials Science
Scientific paper
10.1103/PhysRevB.78.235302
In this work we present a comparison of multiband k.p-models, the effective bond-orbital approach, and an empirical tight-binding model to calculate the electronic structure for the example of a truncated pyramidal GaN/AlN self-assembled quantum dot with a zincblende structure. For the system under consideration, we find a very good agreement between the results of the microscopic models and the 8-band k.p-formalism, in contrast to a 6+2-band k.p-model, where conduction band and valence band are assumed to be decoupled. This indicates a surprisingly strong coupling between conduction and valence band states for the wide band gap materials GaN and AlN. Special attention is paid to the possible influence of the weak spin-orbit coupling on the localized single-particle wave functions of the investigated structure.
Czycholl Gerd
Hickel Tilmann
Marquardt Oliver
Mourad Daniel
Neugebauer Jörg
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