Multispin-assisted optical pumping of bulk C-13 nuclear spin polarization in diamond

Article

关键词: NITROGEN;    HYPERPOLARIZATION;    DYNAMICS;    P1;   

DOI  :  10.1103/PhysRevB.97.024422

来源: SCIE

【 摘 要 】

One of the most remarkable properties of the nitrogen-vacancy (NV) center in diamond is that optical illumination initializes its electronic spin almost completely, a feature that can be exploited to polarize other spin species in their proximity. Here we use field-cycled nuclear magnetic resonance to investigate the mechanisms of spin-polarization transfer from NVs to C-13 spins in diamond at room temperature. We focus on the dynamics near 51 mT, where a fortuitous combination of energy-matching conditions between electron and nuclear spin levels gives rise to alternative polarization transfer channels. By monitoring the C-13 spin polarization as a function of the applied magnetic field, we show C-13 spin pumping takes place via a multispin cross-relaxation process involving the NV- spin and the electronic and nuclear spins of neighboring P1 centers. Further, we find that this mechanism is insensitive to the crystal orientation relative to the magnetic field, although the absolute level of C-13 polarization-reaching up to similar to 3% under optimal conditions-can vary substantially depending on the interplay between optical pumping efficiency, photogenerated carriers, and laser-induced heating.

【 授权许可】

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