Effect of free electron-hole pairs on the saturation of excitonic absorption in GaAs/AlGaAs quantum wells
| Autor: | K. L. Litvinenko, V. G. Lysenko, I. M. Hvam |
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| Rok vydání: | 1998 |
| Předmět: |
Free electron model
Materials science Absorption spectroscopy Condensed Matter::Other Oscillator strength Exciton Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Atomic physics Absorption (electromagnetic radiation) Biexciton Excitation Quantum well |
| Zdroj: | Physics of the Solid State. 40:1032-1034 |
| ISSN: | 1090-6460 1063-7834 |
| Popis: | The pump-probe experimental method is used to investigate the effect of photoexcited carriers on the dynamics of the exciton absorption spectra of GaAs / AlxGa1–xAs-multilayer quantum wells. Use of the method of moment analysis for processing the results makes it possible to identify the simultaneous contribution of changes in oscillator strength and width of the exciton lines in the saturation of exciton absorption. It was found that the oscillator strength recovers its initial value in the course of the first 100–130 ps, whereas broadening and energy-shift of the exciton lines is observed for 700–800 ps. These are the first experimental measurements of the excitation densities at which the oscillator strength of the excitonic state saturates when the latter is perturbed only by free-electron-hole pairs, and when it is perturbed only by other excitons. |
| Databáze: | OpenAIRE |
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