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

Zangara, PR; Dhomkar, S; Ajoy, A; Liu, K; Nazaryan, R; Pagliero, D; Suter, D; ... Meriles, CA; + view all (2019) Dynamics of frequency-swept nuclear spin optical pumping in powdered diamond at low magnetic fields. Proceedings of the National Academy of Sciences , 116 (7) pp. 2512-2520. 10.1073/pnas.1811994116. Green open access

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Abstract

A broad effort is underway to improve the sensitivity of nuclear magnetic resonance 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 NV13C 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-directiondependent 13C spin polarization over a broad range of orientations of the magnetic field. In particular, our results strongly suggest that finely-tuned, moderately coupled nuclear spins are key to the hyperpolarization process, which makes this mechanism distinct from other known dynamic polarization channels. These findings pave the route to applications where powders are intrinsically advantageous, including the hyper-polarization of target fluids in contact with the diamond surface or the use of hyperpolarized particles as contrast agents for in-vivo imaging.

Type: Article
Title: Dynamics of frequency-swept nuclear spin optical pumping in powdered diamond at low magnetic fields
Open access status: An open access version is available from UCL Discovery
DOI: 10.1073/pnas.1811994116
Publisher version: http://doi.org/10.1073/pnas.1811994116
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Nitrogen-vacancy center, hyperpolarization, diamond powder, optical spin pumping, Landau-Zener crossings
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/10075154
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