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

Makhonin, M. N. and Tartakovskii, A. I. and Van'kov, A. B. and Drouzas, I. and Wright, T. and Skiba-Szymanska, J. and Russell, A. and Falko, Vladimir and Skolnick, M. S. and Liu, H. -Y. and Hopkinson, M. (2008) Long nuclear spin polarization decay times controlled by optical pumping in individual quantum dots. Physical review B, 77 (12). ISSN 1098-0121

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Abstract

Nuclear polarization dynamics are measured in the nuclear spin bistability 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 nonlinear nuclear spin dynamics. We measure nuclear spin polarization decay times in the range of 0.2-5 s, 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 (>5s) pumping times. The time-resolved methods allow the detection of the unstable nuclear polarization state in the bistability regime otherwise undetectable in cw experiments.

Item Type:
Journal Article
Journal or Publication Title:
Physical review B
Additional Information:
© 2008 The American Physical Society
Uncontrolled Keywords:
/dk/atira/pure/researchoutput/libraryofcongress/qc
Subjects:
ID Code:
57006
Deposited By:
Deposited On:
16 Aug 2012 15:52
Refereed?:
Yes
Published?:
Published
Last Modified:
05 Jul 2020 03:27