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Dynamic Nuclear Polarization in Silicon Microparticles
We report record high $^{29}\mathrm{Si}$ 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. $^{29}\mathrm{Si}$ nuclei in the amorphous region become polarized by forced electron-nuclear spin flips driven …