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The Japan Society of Applied Physics

Coherent Dynamics of Nitrogen-Vacancy Centers in Diamond Interacting with Isotopically-enriched Nitrogen Nuclear Spins

Ryuushirou Fujita, Ikuya Hanano, Syuhei Uesugi, Hideyuki Watanabe, Yuichiro Matsuzaki, Junko Ishi‐Hayase, Kouichi Akahane

Published Jul 22, 2016• 0 citations
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Nuclear hyperpolarization from optically pumped color centers in solids offers an alternative to conventional microwave-driven dynamic nuclear polarization (DNP). Diamond can host the nitrogen vacancy (NV) center, whose ground spin state can be readily polarized by light at room temperature, making diamond a candidate platform for nuclear hyperpolarization. We report 13C^{13}{\rm C}13C nuclear hyperpolarization in randomly oriented diamond particles with sizes ranging from 0.2 to 2 μμμm, both at natural 13C^{13}{\rm C}13C abundance (1.1 %) and at 20 % isotopic enrichment, at magnetic fields of 7.1 T and 9.4 T. The protocol combines optical illumination with magic angle spinning (MAS) and does not require microwave irradiation. By investigating the nuclear polarization as a function of the MAS frequency between 0 and 6 kHz at the magnetic field of 7.1 T, we find maximum light-induced polarization enhancements of 280280280-fold for the isotopically enriched sample and 411411411-fold for the natural abundance sample. Under continuous illumination, steady-state absolute 13C^{13}{\rm C}13C polarization levels above 0.1 % are reached. A model involving optical pumping of NV centers and spin dynamics near level anticrossings (LACs) in three-spin clusters formed by NV, a substitutional nitrogen (P1) and 13C^{13}{\rm C}13C is used to describe these findings. The protocol strongly mitigates the effect of the anisotropy of the NV spin Hamiltonian, allowing more than 99.9%99.9\%99.9% of NV orientations to participate in the polarization transfer process. These results represent a first step toward transferring nuclear polarization from diamond particles to external nuclei, with potential applications in sensitive and high-resolution NMR at room temperature.