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

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 dyn...

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Bibliographic Details
Published in:arXiv.org 2007-10
Main Authors: Makhonin, M N, Tartakovskii, A I, Drouzas, I, Van'kov, A B, Wright, T, Skiba-Szymanska, J, Russell, A, Fal'ko, V I, Skolnick, M S, H -Y Liu, Hopkinson, M
Format: Article
Language:English
Subjects:
Decay
Diffusion pumps
Dynamic stability
Indium gallium arsenides
Nonlinear dynamics
Nuclear spin
Optical pumping
Polarization (spin alignment)
Quantum dots
Spin dynamics
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.0708.2792