Robust nuclear hyperpolarization driven by strongly coupled nitrogen vacancy centers

Nuclear magnetic resonance techniques are widely used in the natural sciences but they lack sensitivity. Therefore, large sample volumes or long measurement times are necessary. In this work, we investigate the polarization of bulk 13C nuclei in a diamond above the thermal equilibrium at room temper...

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Bibliographic Details
Published in:Journal of applied physics 2021-09, Vol.130 (10)
Main Authors: Wunderlich, Ralf, Staacke, Robert, Knolle, Wolfgang, Abel, Bernd, Haase, Jürgen, Meijer, Jan
Format: Article
Language:English
Subjects:
Diamonds
Electron spin
Induced polarization
Mechanical systems
Nitrogen
NMR
Nuclear magnetic resonance
Quantum mechanics
Room temperature
Vacancies
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Summary:Nuclear magnetic resonance techniques are widely used in the natural sciences but they lack sensitivity. Therefore, large sample volumes or long measurement times are necessary. In this work, we investigate the polarization of bulk 13C nuclei in a diamond above the thermal equilibrium at room temperature. Previously studied mechanisms utilize direct coupling to nitrogen vacancy centers or the additional assistance of substitutional nitrogen impurities for this purpose. We exploit strongly coupled nitrogen vacancy centers as polarization sources. We study two approaches to transfer the optically induced polarization of the electron spins of the nitrogen vacancy centers to nearby nuclear spins. First, the electron-nuclear polarization transfer is achieved by energy matching conditions or, second, by magnetic field sweeps inducing Landau–Zener-like transitions. Simulations according to a quantum mechanical system consisting of two coupled nitrogen vacancy centers and a weakly coupled 13C spin show an excellent agreement with the experimental data. Both approaches allow a reduction of the measurement time by roughly three orders of magnitude.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0052790