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Knight shift detection using gate-induced decoupling of the hyperfine interaction in quantum Hall edge channels

S. Masubuchi·K. Hamaya·T. Machida
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Abstract

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.

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S. Masubuchi, K. Hamaya, T. Machida. 2006-07-03. Knight shift detection using gate-induced decoupling of the hyperfine interaction in quantum Hall edge channels. https://doi.org/10.1063/1.2335595

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