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Spin-flip rate of excitonic magnetic polarons in Cd1−xMnxTe/Cd1−yMgyTe quantum wells

Authors :
Izuru Souma
R. Pittini
J. X. Shen
T. Sato
M. C. Debnath
E. Shirado
Yasuo Oka
Source :
Journal of Applied Physics. 87:6457-6459
Publication Year :
2000
Publisher :
AIP Publishing, 2000.

Abstract

The lifetime of excitons in Cd1−xMnxTe/Cd1−yMgyTe single quantum wells was investigated by time-resolved photoluminescence spectroscopy. Spin-flips between dark and bright excitons remarkably change the excitonic lifetime yielding a two-exponential decay in the photoluminescence intensity. The temperature dependence of the two decay times shows that the spin-flip rate depends strongly on the formation of excitonic magnetic polarons. By forming polarons, the spin-flip rate from dark excitons to bright excitons is reduced effectively by the spin- barriers of the polarized Mn ions, which extends significantly the luminescence decay time.

Details

ISSN :
10897550 and 00218979
Volume :
87
Database :
OpenAIRE
Journal :
Journal of Applied Physics
Accession number :
edsair.doi...........834b8b16bbe8c296d4b964e3577a26e4
Full Text :
https://doi.org/10.1063/1.372737