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- W1621753796 abstract "Time-resolved photoluminescence and four-wave mixing techniques have been combined for studies of carrier relaxation dynamics in a highly photoexcited GaN epilayer. For a moderate excitation density below 1 mJ/cm, carrier recombination was due to free carrier capture by deep traps. The characteristic time of carrier capture, τe = 550 ps, was measured under deep trap saturation regime. The ambipolar diffusion coefficient for free carriers, D = 1.7 cm/s, was estimated from the analysis of the transients of the light-induced gratings of various periods. A complete saturation of the four-wave mixing efficiency was observed for the excitation energy density exceeding 1.5 mJ/cm. The latter saturation effect was shown to be related to electron–hole plasma degeneration, which results in a significant enhancement of carrier recombination rate due to onset of stimulated emission." @default.
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- W1621753796 date "2005-02-01" @default.
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- W1621753796 title "Transients of Carrier Recombination and Diffusion in Highly Excited GaN Studied by Photoluminescence and Four-Wave Mixing Techniques" @default.
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- W1621753796 doi "https://doi.org/10.12693/aphyspola.107.240" @default.
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