| Autor: |
Tabata, A., Martins, M. R., Oliveira, J. B. B., Lamas, T. E., Duarte, C. A., da Silva, E. C. F., Gusev, G. M. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; Nov2007, Vol. 102 Issue 9, p093715, 5p, 1 Diagram, 4 Graphs |
| Abstrakt: |
Photoluminescence measurements at different temperatures have been performed to investigate the optical response of a two-dimensional electron gas in n-type wide parabolic quantum wells. A series of samples with different well widths in the range of 1000–3000 Å was analyzed. Many-body effects, usually observed in the recombination process of a two-dimensional electron gas, appear as a strong enhancement in the photoluminescence spectra at the Fermi level at low temperature only in the thinnest parabolic quantum wells. The suppression of the many-body effect in the thicker quantum wells was attributed to the decrease of the overlap between the wavefunctions of the photocreated holes and the two-dimensional electrons belonging to the highest occupied electron subband. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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