Hydrodynamic approach to coherent nuclear spin transport

Details Hydrodynamic approach to coherent nuclear spin transport Hydrodynamic approach to coherent nuclear spin transport

2004-01-02

arxiv.org/abs/cond-mat/0401013v3

Phys. Rev. B 71, 054403 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, REVTeX4; Published Version

Scientific paper

10.1103/PhysRevB.71.054403

We develop a linear response formalism for nuclear spin diffusion in a dipolar coupled solid. The theory applies to the high-temperature, long-wavelength regime studied in the recent experiments of Boutis et al. [Phys. Rev. Lett. 92, 137201 (2004)], which provided direct measurement of interspin energy diffusion in such a system. A systematic expansion of Kubo's formula in the flip-flop term of the Hamiltonian is used to calculate the diffusion coefficients. We show that this approach is equivalent to the method of Lowe and Gade [Phys. Rev. 156, 817 (1967)] and Kaplan [Phys. Rev. B 2, 4578 (1970)], but has several calculational and conceptual advantages. Although the lowest orders in this expansion agree with the experimental results for magnetization diffusion, this is not the case for energy diffusion. Possible reasons for this disparity are suggested.

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