Distinguishing step relaxation mechanisms via pair correlation functions

Details Distinguishing step relaxation mechanisms via pair correlation functions Distinguishing step relaxation mechanisms via pair correlation functions

2004-08-20

arxiv.org/abs/cond-mat/0408463v1

Phys. Rev. B 70, 235422 [5 pp.] (2004)

Physics

Condensed Matter

Statistical Mechanics

17 pages, 4 figures

Scientific paper

10.1103/PhysRevB.70.235422

Theoretical predictions of coupled step motion are tested by direct STM measurement of the fluctuations of near-neighbor pairs of steps on Si(111)-root3 x root3 R30 - Al at 970K. The average magnitude of the pair-correlation function is within one standard deviation of zero, consistent with uncorrelated near-neighbor step fluctuations. The time dependence of the pair-correlation function shows no statistically significant agreement with the predicted t^1/2 growth of pair correlations via rate-limiting atomic diffusion between adjacent steps. The physical considerations governing uncorrelated step fluctuations occurring via random attachment/detachment events at the step edge are discussed.

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