期刊
PHYSICAL REVIEW B
卷 78, 期 23, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.235302
关键词
aluminium compounds; conduction bands; gallium compounds; III-V semiconductors; k; p calculations; semiconductor quantum dots; spin-orbit interactions; tight-binding calculations; valence bands; wave functions; wide band gap semiconductors
In this work we present a comparison of multiband k center dot 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 zinc-blende structure. For the system under consideration, we find very good agreement between the results of the microscopic models and the eight-band k center dot p formalism, in contrast to a 6+2-band k center dot 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.
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