Abstract
The spin of a confined electron, when oriented originally in some direction, will lose memory of that orientation after some time. Physical mechanisms leading to this relaxation of spin memory typically involve either coupling of the electron spin to its orbital motion or to nuclear spins1,2,3,4,5,6,7. Relaxation of confined electron spin has been previously measured only for Zeeman or exchange split spin states, where spin-orbit effects dominate relaxation8,9,10; spin flips due to nuclei have been observed in optical spectroscopy studies11. Using an isolated GaAs double quantum dot defined by electrostatic gates and direct time domain measurements, we investigate in detail spin relaxation for arbitrary splitting of spin states. Here we show that electron spin flips are dominated by nuclear interactions and are slowed by several orders of magnitude when a magnetic field of a few millitesla is applied. These results have significant implications for spin-based information processing12.
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Acknowledgements
We thank H. A. Engel and P. Zoller for discussions. This work was supported by the ARO, the DARPA-QuIST programme, and the NSF, including the Harvard NSEC.
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Supplementary Methods
This section contains three parts. The first describes technical details of our experiment, the second discusses the effective nuclear field, and the third expands the theory leading up to equations (1) and (2) in the main text. (PDF 181 kb)
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Johnson, A., Petta, J., Taylor, J. et al. Triplet–singlet spin relaxation via nuclei in a double quantum dot. Nature 435, 925–928 (2005). https://doi.org/10.1038/nature03815
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DOI: https://doi.org/10.1038/nature03815
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