Step fluctuations and random walks

Details Step fluctuations and random walks Step fluctuations and random walks

1999-04-13

arxiv.org/abs/cond-mat/9904175v1

Surf. Sci. 437, 137-144 (1999)

Physics

Condensed Matter

16 pages, 6 figures

Scientific paper

10.1016/S0039-6028(99)00709-8

The probability distribution p(l) of an atom to return to a step at distance l from the detachment site, with a random walk in between, is exactly enumerated. In particular, we study the dependence of p(l) on step roughness, presence of other reflecting or absorbing steps, interaction between steps and diffusing atom, as well as concentration of defects on the terrace neighbouring the step. Applying Monte Carlo techniques, the time evolution of equilibrium step fluctuations is computed for specific forms of return probabilities. Results are compared to previous theoretical and experimental findings.

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