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- W2561340731 abstract "We report on low-temperature spatially resolved photoluminescence (SRPL) experiments to study the diffusion of free excitons in a $1.5text{ensuremath{-}}ensuremath{mu}mathrm{m}$-thick layer of high-purity epitaxial GaAs. Extending previous SRPL experiments, we analyze the stationary diffusion profiles detected on the second LO-phonon replica of the free exciton. This allows us to circumvent the inherent interpretation ambiguities of the free-exciton zero-phonon line. Moreover, a spatially resolved line shape analysis of the $(FX)ensuremath{-}2ensuremath{hbar}{mathrm{ensuremath{Omega}}}_{text{LO}}$ replica provides direct experimental access to the pump-induced exciton temperature profile. We demonstrate that only resonant optical excitation prevents the buildup of a temperature gradient in the carrier system, which otherwise severely distorts the stationary and time-resolved free-exciton diffusion profiles." @default.
- W2561340731 created "2017-01-06" @default.
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- W2561340731 date "2015-09-02" @default.
- W2561340731 modified "2023-09-26" @default.
- W2561340731 title "Correct determination of low-temperature free-exciton diffusion profiles in GaAs" @default.
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- W2561340731 doi "https://doi.org/10.1103/physrevb.92.121201" @default.
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