@article{4efd4202104d486385dfc06c12bdf296,
title = "Multispin-Assisted optical pumping of bulk C 13 nuclear spin polarization in diamond",
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 C13 spins in diamond at room temperature. We focus on the dynamics near 51 mT, where a fortuitous combination of energy-matching conditions between electron and nuclear spin levels gives rise to alternative polarization transfer channels. By monitoring the C13 spin polarization as a function of the applied magnetic field, we show C13 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 C13 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.",
author = "Daniela Pagliero and Rao, {K. R.Koteswara} and Zangara, {Pablo R.} and Siddharth Dhomkar and Wong, {Henry H.} and Andrea Abril and Nabeel Aslam and Anna Parker and Jonathan King and Avalos, {Claudia E.} and Ashok Ajoy and Joerg Wrachtrup and Alexander Pines and Meriles, {Carlos A.}",
note = "Funding Information: We thank Neil Manson and Marcus Doherty for kindly providing the sample for these experiments. We also thank Friedemann Reinhard, Alejandro Bussandri, Carlos Sanrame, and Vinod Menon for fruitful discussions and assistance with some of the experiments. D.P., K.R.K.R., H.H.W., A. Abril, S.D., P.R.Z., and C.A.M. acknowledge support from the National Science Foundation through Grants No. NSF-1309640 and No. NSF-1401632, and from the Research Corporation for Science Advancement through a FRED Award; they also acknowledge access to the facilities and research infrastructure of the NSF CREST Center IDEALS, Grant No. NSF-HRD-1547830. APPENDIX A: Funding Information: National Science Foundation through Grants No. NSF-1309640 and No. NSF-1401632, and from the Research Corporation for Science Advancement through a FRED Award; they also acknowledge access to the facilities and research infrastructure of the NSF CREST Center IDEALS, Grant No. NSF-HRD-1547830 Publisher Copyright: {\textcopyright} 2018 American Physical Society.",
year = "2018",
month = jan,
day = "22",
doi = "10.1103/PhysRevB.97.024422",
language = "English (US)",
volume = "97",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "2",
}