Many-body effects in wide parabolic AlGaAs quantum wells

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作者：
Tabata, A. [1 ]
Martins, M.R. [1 ]
Oliveira, J.B.B. [1 ]
Lamas, T.E. [2 ]
Duarte, C.A. [2 ]
Da Silva, E.C.F. [2 ]
Gusev, G.M. [2 ]
机构：
[1] Universidade Estadual Paulista, Caixa Postal 473, Bauru, 17033-360 Sao Paulo, Brazil
[2] Laboratório de Novos Materiais Semicondutores, Instituto de Física, Universidade de São Paulo, CP 66318, 05315-970 São Paulo, Brazil
来源：
| 1600年 / American Institute of Physics, 2 Huntington Quadrangle, Suite N101, Melville, NY 11747-4502, United States卷 / 102期
关键词：
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. © 2007 American Institute of Physics;
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