Dynamics of frequency-swept nuclear spin optical pumping in powdered diamond at low magnetic fields.

ABSTRACT: A broad effort is underway to improve the sensitivity of NMR through the use of dynamic nuclear polarization. Nitrogen vacancy (NV) centers in diamond offer an appealing platform because these paramagnetic defects can be optically polarized efficiently at room temperature. However, work thus far has been mainly limited to single crystals, because most polarization transfer protocols are sensitive to misalignment between the NV and magnetic field axes. Here we study the spin dynamics of NV-¹³C pairs in the simultaneous presence of optical excitation and microwave frequency sweeps at low magnetic fields. We show that a subtle interplay between illumination intensity, frequency sweep rate, and hyperfine coupling strength leads to efficient, sweep-direction-dependent ¹³C

SUBMITTER: Zangara PR 

PROVIDER: S-EPMC6377465 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature