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Exciton spin relaxation time in quantum dots measured by continuous-wave photoluminescence spectroscopy

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6 Author(s)
Mackowski, S. ; Department of Physics, University of Cincinnati, Cincinnati, Ohio 24551-0011 ; Nguyen, T.A. ; Jackson, H.E. ; Smith, L.M.
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Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.1636516 

We demonstrate a method of measuring the exciton spin relaxation time in semiconductor nanostructures by continuous-wave photoluminescence. We find that for self-assembled CdTe quantum dots (QDs) the degree of circular polarization of emission is larger when exciting polarized excitons into the lower energy spin state --polarized) than in the case when the excitons are excited into the higher energy spin state +-polarized). A simple rate equation model gives the exciton spin relaxation time in CdTe QDs equal to τS=4.8±0.3 ns, significantly longer than the QD exciton recombination time τR=300 ps. © 2003 American Institute of Physics.

Published in:

Applied Physics Letters  (Volume:83 ,  Issue: 26 )

Date of Publication:

Dec 2003

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