Control and Detection of Singlet-Triplet Mixing in a Random Nuclear Field
Mesoscale and Nanoscale Physics
2009-11-11 v1
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.
Cite
@article{arxiv.cond-mat/0509053,
title = {Control and Detection of Singlet-Triplet Mixing in a Random Nuclear Field},
author = {F. H. L. Koppens and J. A. Folk and J. M. Elzerman and R. Hanson and L. H. Willems van Beveren and I. T. Vink and H. P. Tranitz and W. Wegscheider and L. P. Kouwenhoven and L. M. K. Vandersypen},
journal= {arXiv preprint arXiv:cond-mat/0509053},
year = {2009}
}
Comments
4 pages main text, 4 figures