title: Stretched exponential relaxation in a diffusive lattice model.
abstract: We studied the single dimer dynamics in a lattice diffusive model as a function of particle density in the high densification regime. The mean square displacement is found to be subdiffusive both in one and two dimensions. The spatial dependence of the self-part of the van Hove correlation function displays as a function of r a single peak and signals a dramatic slow down of the system for high density. The self-intermediate scattering function is fitted to the Kohlrausch-Williams-Watts law. The exponent beta extracted from the fits is density independent while the relaxation time tau follows a scaling law with an exponent 2.5.
authors.affiliation: Dipartimento di Fisica, Università Roma Tre, and Istituto Nazionale per la Fisica della Materia, Unità di Ricerca Roma Tre, Via della Vasca Navale 84, I-00146 Roma, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Fusco
authors.forename: P
authors.initials: P
authors.lastname: Gallo
authors.forename: A
authors.initials: A
authors.lastname: Petri
authors.forename: M
authors.initials: M
authors.lastname: Rovere