title: Simulating flexible polymers in a potential of randomly distributed hard disks.
abstract: We perform equilibrium computer simulations of a two-dimensional pinned flexible polymer exposed to a quenched disorder potential consisting of hard disks. We are especially interested in the high-density regime of the disorder, where subtle structures such as cavities and channels play a central role. We apply an off-lattice growth algorithm proposed by Garel and Orland [J. Phys. A 23, L621 (1990)], where a distribution of polymers is constructed in parallel by growing each of them monomer by monomer. In addition we use a multicanonical Monte Carlo method in order to cross-check the results of the growth algorithm. We measure the end-to-end distribution and the tangent-tangent correlations. We also investigate the scaling behavior of the mean square end-to-end distance in dependence on the monomer number. While the influence of the potential in the low-density case is merely marginal, it dominates the configurational properties of the polymer for high densities.
authors.affiliation: Institut für Theoretische Physik and Centre for Theoretical Sciences (NTZ) Universität Leipzig, Leipzig, Germany.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Schöbl
authors.forename: Johannes
authors.initials: J
authors.lastname: Zierenberg
authors.forename: Wolfhard
authors.initials: W
authors.lastname: Janke