title: Partition function zeros of a square-lattice homopolymer with nearest- and next-nearest-neighbor interactions.
abstract: We study distributions of the partition function zeros in the complex temperature plane for a square-lattice homopolymer with nearest-neighbor (NN) and next-nearest-neighbor (NNN) interactions. The dependence of distributions on the ratio of NN and NNN interaction strengths R is examined. The finite-size scaling of the zeros is performed to obtain the crossover exponent, which is shown to be independent of R within error bars, suggesting that all of these models belong to the same universality class. The transition temperatures are also computed by the zeros to obtain the phase diagram, and the results confirm that the model with stronger NNN interaction exhibits stronger effects of cooperativity.
authors.affiliation: School of Systems Biomedical Science and Department of Bioinformatics and Life Science, Soongsil University, Seoul 156-743, Korea.
authors.forename: Jae Hwan
authors.initials: JH
authors.lastname: Lee
authors.forename: Seung-Yeon
authors.initials: SY
authors.lastname: Kim
authors.forename: Julian
authors.initials: J
authors.lastname: Lee
mesh_terms: D003102:Colloids / Q000737:chemistry*; D003198:Computer Simulation; D008956:Models, Chemical; D008958:Models, Molecular; D044367:Phase Transition; D013696:Temperature
chemical_list: D003102:Colloids