Jpn. J. Appl. Phys. 49 (2010) 103001 (5 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Dynamic Nuclear Polarization of ²⁹Si Nuclei Induced by Li and Li–O Centers in Silicon

Mohammad R. Rahman, Tatsumasa Itahashi, Marina P. Vlasenko¹, Leonid S. Vlasenko¹, Eugene E. Haller², and Kohei M. Itoh

(Received June 4, 2010; accepted July 23, 2010; published online October 20, 2010)

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 ∼352 fold increase with respect to the thermal equilibrium polarization.

URL: http://jjap.jsap.jp/link?JJAP/49/103001/
DOI: 10.1143/JJAP.49.103001

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