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- W2002853591 abstract "A cathodoluminescence emission near 850 nm has been observed in GaAs/AlGaAs selectively doped heterostructures at room temperature which appears related to excitons confined to a two-dimensional electron gas (2DEG). If the structure is grown without Si in the donor layer or if a top confining layer is removed, then this room temperature emission is not observed. At low temperatures (6 K) three peaks are observed at 797, 812, and 817 nm, in which the highest energy peak corresponds to the 850 nm room-temperature emission. Both the low- and high-energy peaks behave similarly with respect to variations in excitation intensity and temperature. A quadratic excitation dependence of the intensity indicates that these emissions are excitonic in origin. Both peaks exhibit quenching above ∼100 K with an activation energy of 0.11 eV, and the peak energies shift to higher energy as the temperature is lowered. While we attribute our 797 nm emission to excitons confined to a 2DEG in the well above the donor layer, the origin of the 817 nm peak is most likely related to excitons confined to the 2DEG in the 3000 Å buffer layer." @default.
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- W2002853591 date "1991-11-18" @default.
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- W2002853591 title "Cathodoluminescence observation of excitons confined to a two‐dimensional electron gas in a selectively doped heterostructure" @default.
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- W2002853591 doi "https://doi.org/10.1063/1.105889" @default.
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