Physics – Condensed Matter – Statistical Mechanics
Scientific paper
1998-11-23
Physics
Condensed Matter
Statistical Mechanics
11 pages, 4 figures (LaTeX with with IOP style files)
Scientific paper
Polymer adsorption on fractally rough walls of varying dimensionality is studied by renormalization group methods on hierarchical lattices. Exact results are obtained for deterministic walls. The adsorption transition is found continuous for low dimension $d_w$ of the adsorbing wall and the corresponding crossover exponent $\phi$ monotonically increases with $d_w$, eventually overcoming previously conjectured bounds. For $d_w$ exceeding a threshold value $d_w^*$, $\phi$ becomes 1 and the transition turns first--order. $d_w^*>d_{saw}$, the fractal dimension of the polymer in the bulk. An accurate numerical approach to the same problem with random walls gives evidence of the same scenario.
Giugliarelli Gilberto
Stella Attilio L.
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