Temperature and magnetic field effects of transient exciton luminescence in Cd1-xMnxTe/Cd1-yMgyTe quantum wells

Authors
Debnath, MC Shen, JX Shirado, E Souma, I Sato, T Pittini, R Oka, Y
Citation
Mc. Debnath et al., Temperature and magnetic field effects of transient exciton luminescence in Cd1-xMnxTe/Cd1-yMgyTe quantum wells, J LUMINESC, 87-9, 2000, pp. 475-477
Citations number
6
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF LUMINESCENCE
ISSN journal
00222313 → ACNP
Volume
87-9
Year of publication
2000
Pages
475 - 477
Database
ISI
SICI code
0022-2313(200005)87-9:<475:TAMFEO>2.0.ZU;2-O
Abstract
The decay properties of excitons in Cd1-xMnxTe/Cd1-yMgyTe single and multip le quantum wells are investigated by the time-resolved photoluminescence me asurements. We observed the conversion of the dark excitons to the bright e xcitons by a spin-flip process. This yields a two-exponential decay of the photoluminescence intensity. The magnetic field dependence of the two-expon ential decay is discussed in the frame of the spin-flip scattering and the giant Zeeman splitting in single quantum wells. The temperature dependence of exciton decays is interpreted by the increase of exciton scattering rate due to thermal activation in multiple quantum well. (C) 2000 Elsevier Scie nce B.V. All rights reserved.