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- W2075903267 abstract "InAs quantum dots in a GaAs matrix have been prepared by molecular beam epitaxy using a self-organizing mechanism. A narrow size distribution of single dots of pyramidal shape (typically with a base of 12 ± 1 nm and a height of 4–6 nm) is created as directly imaged with plan-view and cross-section transmission electron microscopy. The dots exhibit self-organized short range order and preferentially align in rows along 〈100〉. The photoluminescence of the dot ensemble has, due to fluctuations in dot size, shape and strain, a FWHM of typically 50–60 meV. However, using highly spatially and spectrally resolved cathodoluminescence it is possible to directly excite a tiny fraction of all dots (typically only 30 dots). Under these excitation conditions the spectrum changes drastically into a series of ultrasharp lines with a FWHM < 0.15 meV, each originating from a different single InAs quantum dot. This directly visualizes their δ function-like density of electronic states, especially since the lines remain sharp even for kBT⪢FWHM." @default.
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- W2075903267 date "1995-10-01" @default.
- W2075903267 modified "2023-09-30" @default.
- W2075903267 title "Self-organization processes in MBE-grown quantum dot structures" @default.
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- W2075903267 doi "https://doi.org/10.1016/0040-6090(95)06597-0" @default.
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