title: Crossover scaling of apparent first-order wetting in two-dimensional systems with short-ranged forces.
abstract: Recent analyses of wetting in the semi-infinite two-dimensional Ising model, extended to include both a surface coupling enhancement and a surface field, have shown that the wetting transition may be effectively first-order and that surprisingly the surface susceptibility develops a divergence described by an anomalous exponent with value γ_{11}^{eff}=3/2. We reproduce these results using an interfacial Hamiltonian model making a connection with previous studies of two-dimensional wetting, and we show that they follow from the simple crossover scaling of the singular contribution to the surface free-energy, which describes the change from apparent first-order to continuous (critical) wetting due to interfacial tunneling. The crossover scaling functions are calculated explicitly within both the strong-fluctuation and intermediate-fluctuation regimes, and they determine uniquely and more generally the value of γ_{11}^{eff}, which is nonuniversal for the latter regime. The location and the rounding of a line of pseudo-prewetting transitions occurring above the wetting temperature and off bulk coexistence, together with the crossover scaling of the parallel correlation length, are also discussed in detail.
authors.affiliation: Department of Mathematics, Imperial College London, London SW7 2B7, United Kingdom.
authors.forename: Andrew O
authors.initials: AO
authors.lastname: Parry
authors.affiliation: Department of Physical Chemistry, University of Chemical Technology Prague, Praha 6, 166 28, Czech Republic and Institute of Chemical Process Fundamentals of the Czech Academy of Sciences, v.v.i., 165 02 Prague 6, Czech Republic.
authors.forename: Alexandr
authors.initials: A
authors.lastname: Malijevský