High-Field Magnetometry with Hyperpolarized Nuclear Spins

• URL: http://arxiv.org/abs/2112.11612v1
• Date: Wed, 22 Dec 2021 01:33:07 GMT
• Title: High-Field Magnetometry with Hyperpolarized Nuclear Spins
• Authors: Ozgur Sahin (1), Erica de Leon Sanchez (1), Sophie Conti (1), Amala Akkiraju (1), Paul Reshetikhin (1), Emanuel Druga (1), Aakriti Aggarwal (1), Benjamin Gilbert (2), Sunil Bhave (3), Ashok Ajoy (1 and 4) ((1) Department of Chemistry, University of California, Berkeley, (2) Energy Geoscience Division, Lawrence Berkeley National Laboratory, (3) OxideMEMS Lab, Purdue University, (4) Chemical Sciences Division, Lawrence Berkeley National Laboratory)
• Abstract summary: We propose and demonstrate a high-field spin magnetometer constructed from an ensemble of hyperpolarized $13C$ nuclear spins in diamond. For quantum sensing at 7T and a single crystal sample, we demonstrate spectral resolution better than 100 mHz. This work points to interesting opportunities for microscale NMR chemical sensors constructed from hyperpolarized nanodiamonds.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum sensors have attracted broad interest in the quest towards sub-micronscale NMR spectroscopy. Such sensors predominantly operate at low magnetic fields. Instead, however, for high resolution spectroscopy, the high-field regime is naturally advantageous because it allows high absolute chemical shift discrimination. Here we propose and demonstrate a high-field spin magnetometer constructed from an ensemble of hyperpolarized ${}^{13}C$ nuclear spins in diamond. The ${}^{13}C$ nuclei are initialized via Nitrogen Vacancy (NV) centers and protected along a transverse Bloch sphere axis for minute-long periods. When exposed to a time-varying (AC) magnetic field, they undergo secondary precessions that carry an imprint of its frequency and amplitude. The method harnesses long rotating frame ${}^{13}C$ sensor lifetimes $T_2^{\prime}{>}$20s, and their ability to be continuously interrogated. For quantum sensing at 7T and a single crystal sample, we demonstrate spectral resolution better than 100 mHz (corresponding to a frequency precision ${<}$1ppm) and single-shot sensitivity better than 70pT. We discuss the advantages of nuclear spin magnetometers over conventional NV center sensors, including deployability in randomly-oriented diamond particles and in optically scattering media. Since our technique employs densely-packed ${}^{13}C$ nuclei as sensors, it demonstrates a new approach for magnetometry in the "coupled-sensor" limit. This work points to interesting opportunities for microscale NMR chemical sensors constructed from hyperpolarized nanodiamonds and suggests applications of dynamic nuclear polarization (DNP) in quantum sensing.

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