Screening effects on the spin splitting in n-doped GaAs/AlGaAs quantum wells

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 split...

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Bibliographic Details
Published inPhysica. E, Low-dimensional systems & nanostructures Vol. 6; no. 1; pp. 813 - 816
Main Authors Urdanivia, J., Iikawa, F., Brum, J.A., Maialle, M.Z., Hawrylak, P., Wasilewski, Z.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.02.2000
Subjects
Exciton
Spin dynamics
Time-resolved spectroscopy
78.47.+p
Spin dynamics
Exciton
Time-resolved spectroscopy
78.66.-w
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Summary: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.
ISSN:1386-9477
1873-1759
DOI:10.1016/S1386-9477(99)00239-8