Sensitive Magnetic Control of Ensemble Nuclear Spin Hyperpolarisation in Diamond

Abstract

Dynamic nuclear polarisation, which transfers the spin polarisation of electrons to nuclei, is routinely applied to enhance the sensitivity of nuclear magnetic resonance; it is also critical in spintronics, particularly when spin hyperpolarisation can be produced and controlled optically or electrically. Here we show the complete polarisation of nuclei located near the optically-polarised nitrogen-vacancy (NV) centre in diamond. When approaching the ground-state level anti-crossing condition of the NV electron spins, 13C nuclei in the first-shell are polarised in a pattern that depends sensitively and sharply upon the magnetic field. Based on the anisotropy of the hyperfine coupling and of the optical polarisation mechanism, we predict and observe a complete reversal of the nuclear spin polarisation with a few-mT change in the magnetic field. The demonstrated sensitive magnetic control of nuclear polarisation at room temperature will be useful for sensitivity-enhanced NMR, nuclear-based spintronics, and quantum computation in diamond.

References in corpus (4)

• High-sensitivity diamond magnetometer with nanoscale resolution
• Dynamic polarization of single nuclear spins by optical pumping of NV color centers in diamond at room temperature
• Coherence of single spins coupled to a nuclear spin bath of varying density
• Nuclear spin pair coherence in diamond for atomic scale magnetometry