Two-Dimensional Polymers with Random Short-Range Interactions

Details Two-Dimensional Polymers with Random Short-Range Interactions Two-Dimensional Polymers with Random Short-Range Interactions

1997-04-30

arxiv.org/abs/cond-mat/9704244v1

Phys. Rev. E56, R1318-1321 (1997)

Physics

Condensed Matter

Soft Condensed Matter

4 two-column pages, 6 eps figures, RevTex, Submitted to Phys. Rev. E

Scientific paper

10.1103/PhysRevE.56.R1318

We use complete enumeration and Monte Carlo techniques to study two-dimensional self-avoiding polymer chains with quenched ``charges'' $\pm 1$. The interaction of charges at neighboring lattice sites is described by $q_i q_j$. We find that a polymer undergoes a collapse transition at a temperature $T_{\theta}$, which decreases with increasing imbalance between charges. At the transition point, the dependence of the radius of gyration of the polymer on the number of monomers is characterized by an exponent $\nu_{\theta} = 0.60 \pm 0.02$, which is slightly larger than the similar exponent for homopolymers. We find no evidence of freezing at low temperatures.

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