Francesco Parisen Toldin Max-Planck-Institut für Physik Komplexer Systeme
Motivated by recent experiments with confined binary liquid mixtures near demixing, we study the universal critical properties of a system, which belongs to the Ising universality class, in the film geometry. We employ periodic boundary conditions in the two lateral directions and fixed boundary conditions on the two confining surfaces, such that one of them has a spatially homogeneous adsorption preference while the other one exhibits a laterally alternating adsorption preference. By means of Monte Carlo simulations of an improved Hamiltonian, so that the leading scaling corrections are suppressed, numerical integration and finite-size scaling analysis we determine the critical Casimir force and its universal scaling function.
F. Parisen Toldin, S. Dietrich, J. Stat. Mech. (2010) P11003