Control and Detection of Singlet-Triplet Mixing in a Random Nuclear Field
2005
Koppens, F. H. L. | Folk, J. A. | Elzerman, J. M. | Hanson, R. | van Beveren, L. H Willems | Vink, I. T. | Tranitz, H. P. | Wegscheider, W. | Kouwenhoven, L. P. | Vandersypen, L. M. K.
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 [subscript 2] of 25 nanoseconds. Control of the electron-nuclear interaction will therefore be crucial for the coherent manipulation of individual electron spins.
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