Dynamic Nuclear Polarization in Silicon Microparticles

Abstract

We report record high Si-29 spin polarization obtained using dynamic nuclear polarization in microcrystalline silicon powder. Unpaired electrons in this silicon powder are due to dangling bonds in the amorphous region of this intrinsically heterogeneous sample. Si-29 nuclei in the amorphous region become polarized by forced electron-nuclear spin flips driven by off-resonant microwave radiation while nuclei in the crystalline region are polarized by spin diffusion across crystalline boundaries. Hyperpolarized silicon microparticles have long T1 relaxation times and could be used as tracers for magnetic resonance imaging.

4 pages, 5 figures, published version

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• Decay of nuclear hyperpolarization in silicon microparticles
• Tailored nanodiamonds for hyperpolarized 13C MRI
• Metal Ions based Dynamic Nuclear Polarization: MI-DNP
• Efficient Dynamic Polarization of Phosphorus Nuclei in Silicon in Strong Magnetic Fields and Low Temperatures
• Perfect quantum transport in arbitrary spin networks
• High-field Overhauser DNP in silicon below the metal-insulator transition
• Chemisorption of water on the surface of silicon microparticles measured by DNP-enhanced NMR
• DNP-NMR of surface hydrogen on silicon microparticles
• Controlled synthesis and characterization of porous silicon nanoparticles for dynamic nuclear polarization
• Demonstration of Open Quantum System Optimal Control in Dynamic Nuclear Polarization