Speedup of nuclear-spin diffusion in hyperpolarized solids

Abstract

We propose a correction to the coefficient of nuclear-spin diffusion by a factor $1/\sqrt{1-{\overline{p}}^2}$, where $\overline{p}$ is the average nuclear-spin polarization. The correction, derived by extending the Lowe-Gade theory to low-temperature cases, implies that transportation of nuclear magnetization through nuclear-spin diffusion accelerates when the system is hyperpolarized, whereas for low-polarization the correction factor approaches unity and the diffusion coefficient coincides with the conventional diffusion coefficient valid in the high-temperature limit. The proposed scaling of the nuclear-spin diffusion coefficient can lead to observable effects in the buildup of nuclear polarization by dynamic nuclear polarization.

8 pages, 4 figures

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