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26 April 2024

» arxiv » cond-mat/0509053

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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:	2 Sep 2005
Journal:	Science vol 309 p.1346 (2005)
Subject:	Mesoscopic Systems and Quantum Hall Effect \| cond-mat.mes-hall
Abstract:	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.
Source:	arXiv, cond-mat/0509053
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