Dynamic nuclear polarization of 29Si nuclei induced by Li and Li-O centers in silicon

Mohammad R. Rahman; Tatsumasa Itahashi; Marina P. Vlasenko; Leonid S. Vlasenko; Eugene E. Haller; Kohei M. Itoh

doi:10.1143/JJAP.49.103001

Dynamic nuclear polarization of ²⁹Si nuclei induced by Li and Li-O centers in silicon

Mohammad R. Rahman, Tatsumasa Itahashi, Marina P. Vlasenko, Leonid S. Vlasenko, Eugene E. Haller, Kohei M. Itoh

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Abstract

Dynamic nuclear polarization (DNP) of ²⁹Si nuclear spins induced by saturation of electron paramagnetic resonance (EPR) transitions of lithiumrelated 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 underillumination, corresponding to a ∼352 fold increase with respect to the thermal equilibrium polarization.

Original language	English
Pages (from-to)	1030011-1030015
Number of pages	5
Journal	Japanese journal of applied physics
Volume	49
Issue number	10
DOIs	https://doi.org/10.1143/JJAP.49.103001
Publication status	Published - 2010 Oct

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

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title = "Dynamic nuclear polarization of 29Si nuclei induced by Li and Li-O centers in silicon",

abstract = "Dynamic nuclear polarization (DNP) of 29Si nuclear spins induced by saturation of electron paramagnetic resonance (EPR) transitions of lithiumrelated 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 underillumination, corresponding to a ∼352 fold increase with respect to the thermal equilibrium polarization.",

author = "Rahman, {Mohammad R.} and Tatsumasa Itahashi and Vlasenko, {Marina P.} and Vlasenko, {Leonid S.} and Haller, {Eugene E.} and Itoh, {Kohei M.}",

year = "2010",

month = oct,

doi = "10.1143/JJAP.49.103001",

language = "English",

volume = "49",

pages = "1030011--1030015",

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T1 - Dynamic nuclear polarization of 29Si nuclei induced by Li and Li-O centers in silicon

AU - Rahman, Mohammad R.

AU - Itahashi, Tatsumasa

AU - Vlasenko, Marina P.

AU - Vlasenko, Leonid S.

AU - Haller, Eugene E.

AU - Itoh, Kohei M.

PY - 2010/10

Y1 - 2010/10

N2 - Dynamic nuclear polarization (DNP) of 29Si nuclear spins induced by saturation of electron paramagnetic resonance (EPR) transitions of lithiumrelated 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 underillumination, corresponding to a ∼352 fold increase with respect to the thermal equilibrium polarization.

AB - Dynamic nuclear polarization (DNP) of 29Si nuclear spins induced by saturation of electron paramagnetic resonance (EPR) transitions of lithiumrelated 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 underillumination, corresponding to a ∼352 fold increase with respect to the thermal equilibrium polarization.

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Dynamic nuclear polarization of ²⁹Si nuclei induced by Li and Li-O centers in silicon

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