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

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

2005-09-02

arxiv.org/abs/cond-mat/0509053v1

Science vol 309 p.1346 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages main text, 4 figures

Scientific paper

10.1126/science.1113719

We observe 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 is suppressed by applying a small magnetic field, or by increasing the interdot tunnel coupling and thereby the singlet-triplet splitting. Electron transport involving transitions between triplets and singlets in turn polarizes the nuclei, resulting in striking bistabilities. We extract from the fluctuating nuclear field a limitation on the time-averaged spin coherence time T2* of 25 ns. Control of the electron-nuclear interaction will therefore be crucial for the coherent manipulation of individual electron spins.

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