Dynamic nuclear polarization of 29Si via spin S=1 centers in isotopically controlled silicon

T. Itahashi, H. Hayashi, Kohei M Itoh, D. S. Poloskin, L. S. Vlasenko, M. P. Vlasenko

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We report the results of the experiments on dynamic nuclear polarization (DNP) of 29Si nuclei under saturation the electron paramagnetic resonance (EPR) transitions of the photoexcited spin S=1 states of the oxygen+vacancy complexes in irradiated 29Si isotopically controlled silicon. The effect of isotope 29Si abundance on the line width and hyperfine structure of the Si-SL1 EPR spectra was observed. It was shown clearly that the decrease of the 29Si abundance leads to the transformation the DNP mechanism from the "differential" to "resolved" solid-effect accompanied with the increase of DNP degree. High steady-state 29Si nuclear polarization of 6% due to "resolved" solid-effect was achieved in silicon crystals with the 29Si isotope abundance below 4.7%. It was found that the DNP induced by saturation the hyperfine structure EPR lines of triplet centers does not follow the symmetric first derivative EPR line shape, showing the additional contribution to the DNP process.

Original languageEnglish
Pages (from-to)5054-5056
Number of pages3
JournalPhysica B: Condensed Matter
Volume404
Issue number23-24
DOIs
Publication statusPublished - 2009 Dec 15

Fingerprint

Silicon
Polarization
Paramagnetic resonance
electron paramagnetic resonance
silicon
polarization
hyperfine structure
resonance lines
Isotopes
isotopes
saturation
Oxygen vacancies
Linewidth
line shape
Derivatives
Crystals
nuclei
oxygen
crystals
Experiments

Keywords

  • Dynamic nuclear polarization
  • Excited triplet states
  • Silicon

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Cite this

Dynamic nuclear polarization of 29Si via spin S=1 centers in isotopically controlled silicon. / Itahashi, T.; Hayashi, H.; Itoh, Kohei M; Poloskin, D. S.; Vlasenko, L. S.; Vlasenko, M. P.

In: Physica B: Condensed Matter, Vol. 404, No. 23-24, 15.12.2009, p. 5054-5056.

Research output: Contribution to journalArticle

Itahashi, T, Hayashi, H, Itoh, KM, Poloskin, DS, Vlasenko, LS & Vlasenko, MP 2009, 'Dynamic nuclear polarization of 29Si via spin S=1 centers in isotopically controlled silicon', Physica B: Condensed Matter, vol. 404, no. 23-24, pp. 5054-5056. https://doi.org/10.1016/j.physb.2009.08.241
Itahashi, T. ; Hayashi, H. ; Itoh, Kohei M ; Poloskin, D. S. ; Vlasenko, L. S. ; Vlasenko, M. P. / Dynamic nuclear polarization of 29Si via spin S=1 centers in isotopically controlled silicon. In: Physica B: Condensed Matter. 2009 ; Vol. 404, No. 23-24. pp. 5054-5056.
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AU - Itoh, Kohei M

AU - Poloskin, D. S.

AU - Vlasenko, L. S.

AU - Vlasenko, M. P.

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N2 - We report the results of the experiments on dynamic nuclear polarization (DNP) of 29Si nuclei under saturation the electron paramagnetic resonance (EPR) transitions of the photoexcited spin S=1 states of the oxygen+vacancy complexes in irradiated 29Si isotopically controlled silicon. The effect of isotope 29Si abundance on the line width and hyperfine structure of the Si-SL1 EPR spectra was observed. It was shown clearly that the decrease of the 29Si abundance leads to the transformation the DNP mechanism from the "differential" to "resolved" solid-effect accompanied with the increase of DNP degree. High steady-state 29Si nuclear polarization of 6% due to "resolved" solid-effect was achieved in silicon crystals with the 29Si isotope abundance below 4.7%. It was found that the DNP induced by saturation the hyperfine structure EPR lines of triplet centers does not follow the symmetric first derivative EPR line shape, showing the additional contribution to the DNP process.

AB - We report the results of the experiments on dynamic nuclear polarization (DNP) of 29Si nuclei under saturation the electron paramagnetic resonance (EPR) transitions of the photoexcited spin S=1 states of the oxygen+vacancy complexes in irradiated 29Si isotopically controlled silicon. The effect of isotope 29Si abundance on the line width and hyperfine structure of the Si-SL1 EPR spectra was observed. It was shown clearly that the decrease of the 29Si abundance leads to the transformation the DNP mechanism from the "differential" to "resolved" solid-effect accompanied with the increase of DNP degree. High steady-state 29Si nuclear polarization of 6% due to "resolved" solid-effect was achieved in silicon crystals with the 29Si isotope abundance below 4.7%. It was found that the DNP induced by saturation the hyperfine structure EPR lines of triplet centers does not follow the symmetric first derivative EPR line shape, showing the additional contribution to the DNP process.

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