Continuum theory of vacancy-mediated diffusion

Details Continuum theory of vacancy-mediated diffusion Continuum theory of vacancy-mediated diffusion

1998-06-24

arxiv.org/abs/cond-mat/9806291v1

Physics

Condensed Matter

Statistical Mechanics

25 Latex pages, subm. to Physical Review B

Scientific paper

10.1103/PhysRevB.59.13754

We present and solve a continuum theory of vacancy-mediated diffusion (as evidenced, for example, in the vacancy driven motion of tracers in crystals). Results are obtained for all spatial dimensions, and reveal the strongly non-gaussian nature of the tracer fluctuations. In integer dimensions, our results are in complete agreement with those from previous exact lattice calculations. We also extend our model to describe the vacancy-driven fluctuations of a slaved flux line.

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