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Originally published in Science Express on 21 July 2005
Science 26 August 2005:
Vol. 309. no. 5739, pp. 1346 - 1350
DOI: 10.1126/science.1113719
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Reports

Control and Detection of Singlet-Triplet Mixing in a Random Nuclear Field

F. H. L. Koppens,1* J. A. Folk,1* J. M. Elzerman,1 R. Hanson,1 L. H. Willems van Beveren,1 I. T. Vink,1 H. P. Tranitz,2 W. Wegscheider,2 L. P. Kouwenhoven,1 L. M. K. Vandersypen1{dagger}

We observed mixing between two-electron singlet and triplet states in a double quantum dot, caused by interactions with nuclear spins in the host semiconductor. This mixing was suppressed when we applied a small magnetic field or increased the interdot tunnel coupling and thereby the singlet-triplet splitting. Electron transport involving transitions between triplets and singlets in turn polarized the nuclei, resulting in marked bistabilities. We extract from the fluctuating nuclear field a limitation on the time-averaged spin coherence time T of 25 nanoseconds. Control of the electron-nuclear interaction will therefore be crucial for the coherent manipulation of individual electron spins.

1 Kavli Institute of Nanoscience, Delft University of Technology, Post Office Box 5046, 2600 GA Delft, Netherlands.
2 Institut für Angewandte und Experimentelle Physik, Universität Regensburg, Regensburg, Germany.

* These authors contributed equally to this work.

{dagger} To whom correspondence should be addressed. E-mail: lieven{at}qt.tn.tudelft.nl

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