Stationary State Skewness in KPZ Type Growth

Details Stationary State Skewness in KPZ Type Growth Stationary State Skewness in KPZ Type Growth

1996-10-25

arxiv.org/abs/cond-mat/9610189v1

Physics

Condensed Matter

Statistical Mechanics

29 pages, 4 figures, plain TeX

Scientific paper

10.1088/0305-4470/30/6/019

Stationary states in KPZ type growth have interesting short distance properties. We find that typically they are skewed and lack particle-hole symmetry. E.g., hill-tops are typically flatter than valley bottoms, and all odd moments of the height distribution function are non-zero. Stationary state skewness can be turned on and off in the 1+1 dimensional RSOS model. We construct the exact stationary state for its master equation in a 4 dimensional parameter space. In this state steps are completely uncorrelated. Familiar models such as the Kim-Kosterlitz model lie outside this space, and their stationary states are skewed. We demonstrate using finite size scaling that the skewness diverges with systems size, but such that the skewness operator is irrelevant in 1+1 dimensions, with an exponent $y_{sk}\simeq-1$, and that the KPZ fixed point lies at zero-skewness.

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