Please use this identifier to cite or link to this item:
|Type:||Artigo de periódico|
|Title:||Screening effects on the spin splitting in n-doped GaAs/AlGaAs quantum wells|
|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.|
|Editor:||Elsevier Science Bv|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.