Dynamic nuclear polarization of S 29 I nuclei in isotopically controlled phosphorus doped silicon

Hiroshi Hayashi, Tatsumasa Itahashi, Kohei M. Itoh, Leonid S. Vlasenko, Marina P. Vlasenko

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Dynamic nuclear polarization (DNP) of S 29 i nuclei in isotopically controlled silicon single crystals with the S 29 i isotope abundance f29Si varied from 1.2% to 99.2% is reported. It was found that both the DNP enhancement and S 29 i nuclear spin-lattice relaxation time under saturation of the electron paramagnetic resonance transitions of phosphorus donors increase with the decrease in the S 29 i abundance. A remarkably large steady-state DNP enhancement, Ess =2680 which is comparable to the theoretical upper limit of 3310, has been achieved through the "resolved" solid effect that has been identified clearly in the f29Si =1.2% sample. The DNP enhancement depends not only on the S 29 i abundance but also on the electron spin-lattice relaxation time that can be controlled by temperature and/or illumination. The linewidth of S 29 i NMR spectra after DNP shows a linear dependence on f29Si for f29Si ≤10% and changes to a square-root dependence for f29Si 50%. Comparison of experimentally determined nuclear polarization time with nuclear spin diffusion coefficients indicates that the rate of DNP is limited by the polarization transfer rather than by spin diffusion.

Original languageEnglish
Article number045201
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number4
DOIs
Publication statusPublished - 2009 Aug 6

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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