Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2008-05-31
Phys. Rev. B 77, 245306 (2008)
Physics
Condensed Matter
Other Condensed Matter
to appear in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.77.245306
Spin dynamics of a single electron and an exciton confined in CdTe/ZnTe quantum dot is investigated by polarization-resolved correlation spectroscopy. Spin memory effects extending over at least a few tens of nanoseconds have been directly observed in magnetic field and described quantitatively in terms of a simple rate equation model. We demonstrate an effective (68%) all-optical read-out of the single carrier spin state through probing the degree of circular polarization of exciton emission after capture of an oppositely charged carrier. The perturbation introduced by the pulsed optical excitation serving to study the spin dynamics has been found to be the main source of the polarization loss in the read-out process. In the limit of low laser power the read-out efficiency extrapolates to a value close to 100%. The measurements allowed us as well to determine neutral exciton spin relaxation time ranging from 3.4 +/- 0.1 ns at B = 0 T to 16 +/- 3 ns at B = 5 T.
Gaj Jan A.
Golnik Andrzej
Goryca Mateusz
Kazimierczuk Tomasz
Kossacki Piotr
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