Sequence randomness and polymer collapse transitions
arXiv:cond-mat/9901182 · doi:10.1103/PhysRevLett.83.112
Abstract
Contrary to expectations based on Harris' criterion, chain disorder with frustration can modify the universality class of scaling at the theta transition of heteropolymers. This is shown for a model with random two-body potentials in 2D on the basis of exact enumeration and accurate Monte Carlo results. When frustration grows beyond a certain finite threshold, the temperature below which disorder becomes relevant coincides with the theta one and scaling exponents definitely start deviating from those valid for homopolymers.
4 pages, 4 eps figures