Hot photoluminescence of GaAs-AlGaAs multiple quantum well structures under high excitation by a single shot of 30 ps, 532 nm laser |
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Authors: | H Uchiki Y Arakawa H Sakaki T Kobayashi |
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Institution: | 1. Department of Physics, Faculty of Science, University of Tokyo, Bunkyo-ku, Tokyo 113 Japan;1. Department of Physics, Faculty of Science, University of Tokyo, Bunkyo-ku, Tokyo 113 Japan |
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Abstract: | Energy-resolved decay times and time-resolved spectra of hot photoluminescence of GaAs-AlGaAs multiple quantum well structures at 77 K under high excitation (50 MW/cm2) were measured by single shot experiments with the use of a 30 ps, 532 nm laser, a streak camera, and an optical multichannel analyzer. It was found that the transition between higher subbands (n=2 e-hh) appears and its intensity relaxes with a decay time of about 200 ps. The theoretical expression for carrier relaxation in a two-dimensional quantum well was obtained. We found that the calculated energy loss rate due to Lo-phonon scattering (10 meV/ps) is at least four times larger than the observed one (2.7 meV/ps). |
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