Dynamic Nuclear Polarization of 29Si Nuclei Induced by Li and Li–O Centers in Silicon

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概要

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• Dynamic nuclear polarization (DNP) of 29Si nuclear spins induced by saturation of electron paramagnetic resonance (EPR) transitions of lithium-related centers in float zone (FZ) grown silicon is reported. Both isolated Li and Li–O complex centers showed strong EPR absorption lines in the temperature range 3.4–10 K and led to very efficient orientation of 29Si nuclear spins. The temperature dependence and time constant of 29Si DNP are investigated in detail. The 29Si DNP of 0.72% was achieved at 3.4 K by excitation of the Li–O forbidden EPR transition under illumination, corresponding to a ${\sim}352$ fold increase with respect to the thermal equilibrium polarization.

• 2010-10-25

著者

• Itoh Kohei

  School Of Fundamental Science And Technology Keio University

• Haller Eugene

  Lawrence Berkeley National Laboratory And University Of California

• Vlasenko Leonid

  A. F. Ioffe Physico-Technical Institute of Russian Academy of Sciences, 194021 St. Petersburg, Russia

• Vlasenko Leonid

  A. F. Ioffe Physico-Technical Institute, 194021 St. Petersburg, Russia

• Rahman Mohammad

  School of Fundamental Science and Technology, Keio University, Yokohama 223-8522, Japan

• Itahashi Tatsumasa

  School of Fundamental Science and Technology, Keio University, Yokohama 223-8522, Japan

• Vlasenko Marina

  A. F. Ioffe Physico-Technical Institute, 194021 St. Petersburg, Russia

• Haller Eugene

  Lawrence Berkeley National Laboratory and UC Berkeley, 1 Cyclotron Rd., Berkeley, CA 94720, U.S.A.

• ITOH Kohei

  School of Fundamental Science and Technology and CREST-JST, Keio University

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• Dynamic Nuclear Polarization of 29Si Nuclei Induced by Li and Li–O Centers in Silicon
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• Photoluminescence Study of Radiation-Enhanced Dislocation Glide in 4H-SiC

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