title: Grassmannian representation of the two-dimensional monomer-dimer model.
abstract: We present an application of the Grassmann algebra to the problem of the monomer-dimer statistics on a two-dimensional square lattice. The exact partition function, or total number of possible configurations, of a system of dimers with a finite set of n monomers at fixed positions can be expressed via a quadratic fermionic theory. We give an answer in terms of a product of two pfaffians and the solution is closely related to the Kasteleyn result of the pure dimer problem. Correlation functions are in agreement with previous results, both for monomers on the boundary, where a simple exact expression is available in the discrete and continuous case, and in the bulk where the expression is evaluated numerically.
authors.affiliation: Institut Jean Lamour, CNRS/UMR 7198, Groupe de Physique Statistique, Université de Lorraine, BP 70239, F-54506 Vandœuvre-lès-Nancy Cedex, France.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Allegra
authors.affiliation: Institut Jean Lamour, CNRS/UMR 7198, Groupe de Physique Statistique, Université de Lorraine, BP 70239, F-54506 Vandœuvre-lès-Nancy Cedex, France.
authors.forename: Jean-Yves
authors.initials: JY
authors.lastname: Fortin
mesh_terms: D019281:Dimerization; D008956:Models, Chemical; D015233:Models, Statistical; D012996:Solutions
chemical_list: D012996:Solutions