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Type: Artigo de periódico
Title: Screening effects on the spin splitting in n-doped GaAs/AlGaAs quantum wells
Author: Urdanivia, J
Iikawa, F
Brum, JA
Maialle, MZ
Hawrylak, P
Wasilewski, Z
Abstract: The spin dynamics of free carriers is studied by time-resolved photoluminescence in n-type GaAs/AlGaAs modulation-doped multi-quantum wells. We study a series of samples with different two-dimensional electron densities. The photoluminescence spectra obtained at fixed time delay present energy splitting for the two different circularly polarized configurations. This energy splitting increases with the laser power and decreases as the intrinsic electron density increases. We interpret these results as a combination of two effects: the screening of the Coulomb interaction which decreases the exciton binding energy and the phase-space filling, which enhances the splitting between the two polarized exciton populations. (C) 2000 Elsevier Science B.V. All rights reserved.
Subject: exciton
spin dynamics
time-resolved spectroscopy
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/S1386-9477(99)00239-8
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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