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- W3048902011 abstract "Abstract Contrary to simplified theoretical models, atomistic calculations presented here reveal that sufficiently large in-plane shape elongation of quantum dots can not only decrease, but even reverse the splitting of the two lowest optically active excitonic states. Such a surprising cancellation of bright-exciton splitting occurs for shape-anisotropic nanostructures with realistic elongation ratios, yet without a wetting layer, which plays here a vital role. However, this non-trivial effect due to shape-elongation is strongly diminished by alloy randomness resulting from intermixing of InAs quantum-dot material with the surrounding InP matrix. Alloying randomizes, and to some degree flattens the shape dependence of fine-structure splitting giving a practical justification for the application of simplified theories. Finally, we find that the dark-exciton spectra are rather weakly affected by alloying and are dominated by the effects of lateral elongation." @default.
- W3048902011 created "2020-08-18" @default.
- W3048902011 creator A5029508763 @default.
- W3048902011 date "2020-08-11" @default.
- W3048902011 modified "2023-10-16" @default.
- W3048902011 title "Vanishing fine structure splitting in highly asymmetric InAs/InP quantum dots without wetting layer" @default.
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