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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: Article
    Journal or Publication Title: Physical Review B
    Additional Information: © 2008 The American Physical Society
    Subjects: Q Science > QC Physics
    Departments: Faculty of Science and Technology > Physics
    Faculty of Science and Technology > Engineering
    ID Code: 57006
    Deposited By: ep_importer_pure
    Deposited On: 16 Aug 2012 16:52
    Refereed?: Yes
    Published?: Published
    Last Modified: 19 Dec 2013 16:56
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/57006

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