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  • Title: Control and detection of singlet-triplet mixing in a random nuclear field.
    Author: Koppens FH, Folk JA, Elzerman JM, Hanson R, van Beveren LH, Vink IT, Tranitz HP, Wegscheider W, Kouwenhoven LP, Vandersypen LM.
    Journal: Science; 2005 Aug 26; 309(5739):1346-50. PubMed ID: 16037418.
    Abstract:
    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 T2* 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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