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Long nuclear spin decay times controlled by optical pumping in individual quantum dots

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arxiv 0708.2792 v2 pith:3NMKZHN2 submitted 2007-08-21 cond-mat.mes-hall cond-mat.mtrl-sci

Long nuclear spin decay times controlled by optical pumping in individual quantum dots

M. N. Makhonin , A. I. Tartakovskii , I. Drouzas , A. B. Van'kov , T. Wright , J. Skiba-Szymanska , A. Russell , V. I. Fal'ko
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M. S. Skolnick H.-Y. Liu M. Hopkinson
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classification cond-mat.mes-hall cond-mat.mtrl-sci
keywords nuclearspindecaylongpolarizationpumpingtimesbi-stability
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Nuclear polarization dynamics are measured in the nuclear spin bi-stability regime in a single optically pumped InGaAs/GaAs quantum dot. The controlling role of nuclear spin diffusion from the dot into the surrounding material is revealed in pump-probe measurements of the non-linear nuclear spin dynamics. We measure nuclear spin decay times in the range 0.2-5 sec, strongly dependent on the optical pumping time. The long nuclear spin decay arises from polarization of the material surrounding the dot by spin diffusion for long (>5sec) pumping times. The time-resolved methods allow the detection of the unstable nuclear polarization state in the bi-stability regime otherwise undetectable in cw experiments.

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