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- W2334504246 abstract "We study in detail self-assembled (In,Ga)As quantum dots grown on GaP substrate from the structural, theoretical, and optical points of view. Single quantum dot morphology is first determined at the atomic level using plane-view scanning tunneling microscopy. Unusual ${C}_{2}$ symmetry properties with high-index ${136}$ facets are demonstrated for small quantum dots, whereas the apparent shape of the quantum dots approximately exhibits ${C}_{2v}$ symmetry, with the appearance of low-index ${111}$ facets when the quantum dot ripens. This is interpreted as a consequence of the competition between strain and surface energy during quantum dot formation. Electronic properties are then simulated using both kifmmodecdotelsetextperiodcenteredfi{}p and tight-binding models. The indium content and geometry of the quantum dots are found to have a strong influence on the transition type (direct-indirect). Finally, temperature-dependent optical properties of quantum dots are analyzed between 10 and 375 K. Photoluminescence and time-resolved photoluminescence studies show a clear proximity of two different types of optical transitions. Supported by the theoretical calculations, these transitions are interpreted as a competition between conduction band states in the $X$ and ensuremath{Gamma} valleys." @default.
- W2334504246 created "2016-06-24" @default.
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- W2334504246 date "2012-11-19" @default.
- W2334504246 modified "2023-10-02" @default.
- W2334504246 title "Electronic, optical, and structural properties of (In,Ga)As/GaP quantum dots" @default.
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- W2334504246 doi "https://doi.org/10.1103/physrevb.86.205316" @default.
- W2334504246 hasPublicationYear "2012" @default.
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