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Dynamics of frequency-swept nuclear spin optical pumping in powdered diamond at low magnetic fields.
Zangara, Pablo R; Dhomkar, Siddharth; Ajoy, Ashok; Liu, Kristina; Nazaryan, Raffi; Pagliero, Daniela; Suter, Dieter; Reimer, Jeffrey A; Pines, Alexander; Meriles, Carlos A.
Afiliación
  • Zangara PR; Department of Physics, City College of New York, City University of New York, New York, NY 10031.
  • Dhomkar S; Department of Physics, City College of New York, City University of New York, New York, NY 10031.
  • Ajoy A; Department of Chemistry, University of California, Berkeley, CA 94720.
  • Liu K; Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720.
  • Nazaryan R; Department of Chemistry, University of California, Berkeley, CA 94720.
  • Pagliero D; Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720.
  • Suter D; Department of Chemistry, University of California, Berkeley, CA 94720.
  • Reimer JA; Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720.
  • Pines A; Department of Physics, City College of New York, City University of New York, New York, NY 10031.
  • Meriles CA; Fakultät Physik, Technische Universität Dortmund, D-44221 Dortmund, Germany.
Proc Natl Acad Sci U S A ; 116(7): 2512-2520, 2019 02 12.
Article en En | MEDLINE | ID: mdl-30679282
A broad effort is underway to improve the sensitivity of NMR through the use of dynamic nuclear polarization. Nitrogen vacancy (NV) centers in diamond offer an appealing platform because these paramagnetic defects can be optically polarized efficiently at room temperature. However, work thus far has been mainly limited to single crystals, because most polarization transfer protocols are sensitive to misalignment between the NV and magnetic field axes. Here we study the spin dynamics of NV-13C pairs in the simultaneous presence of optical excitation and microwave frequency sweeps at low magnetic fields. We show that a subtle interplay between illumination intensity, frequency sweep rate, and hyperfine coupling strength leads to efficient, sweep-direction-dependent 13C spin polarization over a broad range of orientations of the magnetic field. In particular, our results strongly suggest that finely tuned, moderately coupled nuclear spins are key to the hyperpolarization process, which makes this mechanism distinct from other known dynamic polarization channels. These findings pave the route to applications where powders are intrinsically advantageous, including the hyperpolarization of target fluids in contact with the diamond surface or the use of hyperpolarized particles as contrast agents for in vivo imaging.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Proc Natl Acad Sci U S A Año: 2019 Tipo del documento: Article Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Proc Natl Acad Sci U S A Año: 2019 Tipo del documento: Article Pais de publicación: Estados Unidos