Many-body effects in wide parabolic AlGaAs quantum wells
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Data
2007-11-01
Autores
Tabata, Américo Sheitiro [UNESP]
Martins, M. R.
Oliveira, José Brás Barreto de [UNESP]
Lamas, T. E.
Duarte, C. A.
da Silva, E. C. F.
Gusev, G. M.
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American Institute of Physics (AIP)
Resumo
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 A 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. (C) 2007 American Institute of Physics.
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Journal of Applied Physics. Melville: Amer Inst Physics, v. 102, n. 9, 5 p., 2007.