A method for the observation of the Knight shift in nanometer-scale region in semiconductors is developed using resistively detected nuclear magnetic resonance (RDNMR) technique in quantum Hall edge channels. Using a gate-induced decoupling of the hyperfine interaction between electron and nuclear spins, we obtain the RDNMR spectra with or without the electron-nuclear spin coupling. By a comparison of these two spectra, the values of the Knight shift can be given for the nuclear spins polarized dynamically in the region between the relevant edge channels in a single two-dimensional electron system, indicating that this method has a very high sensitivity compared to a conventional NMR technique.
@article{arxiv.cond-mat/0607028,
title = {Knight shift detection using gate-induced decoupling of the hyperfine interaction in quantum Hall edge channels},
author = {S. Masubuchi and K. Hamaya and T. Machida},
journal= {arXiv preprint arXiv:cond-mat/0607028},
year = {2009}
}
Comments
4 pages, 4 figures, to appear in Applied Physics Letters