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- W2019962011 abstract "Bright flashes of exciton emission are observed in photoexcited, undoped GaAs/AlGaAs quantum wells under pulsed microwave (36 GHz) irradiation. The flash intensity is in the range of 10--100 times the steady-state photoluminescence intensity with a decay time of $(1--10)ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}8}text{ }text{s}$ (depending on the applied microwave power and photoexcitation). These observations indicate a reservoir of long-lived carriers that is formed at low temperature due to localization of photogenerated electrons and holes at spatially separated shallow traps. Microwave-heated electrons activate the localized carriers into free states by means of avalanche impact ionization. This gives rise to rapid exciton formation with subsequent luminescence flash. A detailed model based on the coupled rate equations for free electrons, excitons and localized electrons (holes) is presented." @default.
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- W2019962011 date "2009-05-26" @default.
- W2019962011 modified "2023-10-07" @default.
- W2019962011 title "Luminescence flashes induced by microwave radiation in undoped GaAs quantum wells" @default.
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- W2019962011 doi "https://doi.org/10.1103/physrevb.79.195325" @default.
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