"Devil staircase" of phase transitions in primitive model of adsorption of dimers
The primitive model of multicenter adsorption on the hexagonal lattice is constructed and studied, taking into account different orientations of molecules with respect to surface. The model is studied using the transfer-matrix method. A method for the transformation of a hexagonal lattice to a square lattice is proposed. This greatly simplifies the calculations. Interesting and fairy rare phenomenon is found: the transition from the phase with only horizontally oriented dimers to the phase with only vertically oriented dimers goes through infinite sequence of ordered structures.