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

Mackowski, S.; Nguyen, T.A.; Jackson, H.E.; Smith, L.M.; Kossut, J.; Karczewski, G.
December 2003
Applied Physics Letters;12/29/2003, Vol. 83 Issue 26, p5524
Academic Journal
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 (σ[sup -]-polarized) than in the case when the excitons are excited into the higher energy spin state (σ[sup +]-polarized). A simple rate equation model gives the exciton spin relaxation time in CdTe QDs equal to τ[sub S]=4.8±0.3 ns, significantly longer than the QD exciton recombination time τ[sub R]=300 ps. © 2003 American Institute of Physics.


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