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26 April 2024

» pubmed » pmid16037418

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Control and detection of singlet-triplet mixing in a random nuclear field
F H L Koppens ; J A Folk ; J M Elzerman ; R Hanson ; L H Willems van Beveren ; I T Vink ; H P Tranitz ; W Wegscheider ; L P Kouwenhoven ; L M K Vandersypen ;
Date:	26 Aug 2005
Journal:	Science, 309 (5739), 1346-50
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.
Source:	PubMed, pmid16037418 doi: 10.1126/science.1113719
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