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Multispin-assisted optical pumping of bulk ¹³C nuclear spin polarization in diamond

Pagliero, D; Rao, KRK; Zangara, PR; Dhomkar, S; Wong, HH; Abril, A; Aslam, N; ... Meriles, CA; + view all (2018) Multispin-assisted optical pumping of bulk ¹³C nuclear spin polarization in diamond. Physical Review B , 97 (2) , Article 024422. 10.1103/PhysRevB.97.024422. Green open access

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Abstract

One of the most remarkable properties of the nitrogen-vacancy (NV) center in diamond is that optical illumination initializes its electronic spin almost completely, a feature that can be exploited to polarize other spin species in their proximity. Here we use field-cycled nuclear magnetic resonance to investigate the mechanisms of spin-polarization transfer from NVs to ¹³C One of the most remarkable properties of the nitrogen-vacancy (NV) center in diamond is that optical illumination initializes its electronic spin almost completely, a feature that can be exploited to polarize other spin species in their proximity. Here we use field-cycled nuclear magnetic resonance to investigate the mechanisms of spin-polarization transfer from NVs to ¹³C spin polarization as a function of the applied magnetic field, we show ¹³C spin pumping takes place via a multispin cross-relaxation process involving the NV⁻ spin and the electronic and nuclear spins of neighboring P1 centers. Further, we find that this mechanism is insensitive to the crystal orientation relative to the magnetic field, although the absolute level of ¹³C polarization—reaching up to ∼3% under optimal conditions—can vary substantially depending on the interplay between optical pumping efficiency, photogenerated carriers, and laser-induced heating.

Type: Article
Title: Multispin-assisted optical pumping of bulk ¹³C nuclear spin polarization in diamond
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.97.024422
Publisher version: https://doi.org/10.1103/PhysRevB.97.024422
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: NV centers, Spin polarization, Spin relaxation, Diamond, Nitrogen vacancy centers in diamond, Nuclear magnetic resonance
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/10053785
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