General self-flattening surfaces

Details General self-flattening surfaces General self-flattening surfaces

2003-03-17

arxiv.org/abs/cond-mat/0303301v1

Physics

Condensed Matter

Statistical Mechanics

3 pages, no figures, submitted to PRE as a Comment

Scientific paper

Recently Jeong and Kim [Phys. Rev. E {\bf 66}, 051605 (2002)] investigated the scaling properties of equilibrium self-flattening surfaces subject to a restricted curvature constraint. In one dimension (1D), they found numerically that the stationary roughness exponent $\alpha\approx 0.561$ and the window exponent $\delta\approx 0.423$. We present an analytic argument for general self-flattening surfaces in $D$ dimensions, leading to $\alpha=D\alpha_0 /(D+\alpha_0)$ and $\delta=D/(D+\alpha_0)$ where $\alpha_0$ is the roughness exponent for equilibrium surfaces without the self-flattening mechanism. In case of surfaces subject to a restricted curvature constraint, it is known exactly that $\alpha_0=3/2$ in 1D, which leads to $\alpha=3/5$ and $\delta=2/5$. Small discrepancies between our analytic values and their numerical values may be attributed to finite size effects.

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