Fig. 1: 13C Sensor Strategy.
From: High field magnetometry with hyperpolarized nuclear spins
A System. Diamond lattice with dipolar coupled (dashed lines) 13C nuclei, hyperpolarized (blue arrows) by optically pumped NV center defects. B Principle. Hyperpolarized 13C nuclei are driven in to the \(\hat{{{{{{{{\bf{x}}}}}}}}}\) axis (red arrow) via spin-locking. When an AC field (blue) is applied along \(\hat{{{{{{{{\bf{z}}}}}}}}}\), the spins undergo secondary precessions (arrows). Deviation from \(\hat{{{{{{{{\bf{x}}}}}}}}}\) constitutes the magnetometer signal. Case shown corresponds to θ = π/2 (Fig. 2A), where the spins trace the corners of a square when projected onto the \(\hat{{{{{{{{\bf{y}}}}}}}}}-\hat{{{{{{{{\bf{z}}}}}}}}}\) plane over four pulses (period 4τ in Fig. 2A).
