Wetting of Rough Walls |
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Authors: | A. Stella G. Sartoni G. Giugliarelli M. R. D'Orsogna |
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Affiliation: | (1) INFM–Dipartimento di Fisica and Sezione INFN, Universitá di Padova, 35131 Padova, Italy;(2) Instituut-Lorentz, Rijks Universiteit Leiden, 2300 RA Leiden, The Netherlands;(3) INFM, Unitá di Padova, and Dipartimento di Fisica, Universitá di Udine, I-33100 Udine, Italy |
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Abstract: | Quenched geometric disorder of a wall delimiting a spectator phase can have dramatic effects on the nature of critical wetting transitions. We consider self-affine walls in 2D with roughness exponent W. Transfer matrix results for directed interfacial models with short-range interactions suggest that wetting turns first-order as soon as W exceeds 0, the anisotropy index of interface fluctuations in the bulk. Discontinuous interface depinning is best identified by a peculiar two-peak structure in the statistical distributions of wall–interface contacts obtained by sampling over disorder. On the other hand, for W<0 wetting remains continuous, most plausibly in the same universality class as with flat walls. This occurs both with ordered (0 = 1/2) and with bond-disordered (0 = 2/3) bulk. A precise location of the thresholds at W = 0 can be argued on the basis of an analysis of different terms in the interfacial free energy. This analysis elucidates the peculiar role played by the intrinsic interfacial roughness and suggests extensions of the results to 3D and to long-range substrate forces. |
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Keywords: | bulk disorder geometrical surface disorder statistical physics wetting transitions |
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