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Coarse-graining a restricted solid-on-solid model

Achilleas Lazarides
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Abstract

A procedure suggested by Vvedensky for obtaining continuum equations as the coarse-grained limit of discrete models is applied to the restricted solid-on-solid model with both adsorption and desorption. Using an expansion of the master equation, discrete Langevin equations are derived; these agree quantitatively with direct simulation of the model. From these, a continuum differential equation is derived, and the model is found to exhibit either Edwards-Wilkinson or Kardar-Parisi-Zhang exponents, as expected from symmetry arguments. The coefficients of the resulting continuum equation remain well-defined in the coarse-grained limit.

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Achilleas Lazarides. 2006-03-28. Coarse-graining a restricted solid-on-solid model. https://doi.org/10.1103/physreve.73.041605

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