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

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

2007-08-21

arxiv.org/abs/0708.2792v2

Phys. Rev. B 77, 125307 (2008) - Published March 6, 2008

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, submitted to PRL

Scientific paper

10.1103/PhysRevB.77.125307

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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