Theta-point universality of polyampholytes with screened interactions

Details Theta-point universality of polyampholytes with screened interactions Theta-point universality of polyampholytes with screened interactions

1998-07-09

arxiv.org/abs/cond-mat/9807133v2

Physics

Condensed Matter

Soft Condensed Matter

15 REVTEX pages. 4 eps-figures . 1 table

Scientific paper

10.1103/PhysRevE.59.1887

By an efficient algorithm we evaluate exactly the disorder-averaged statistics of globally neutral self-avoiding chains with quenched random charge $q_i=\pm 1$ in monomer i and nearest neighbor interactions $\propto q_i q_j$ on square (22 monomers) and cubic (16 monomers) lattices. At the theta transition in 2D, radius of gyration, entropic and crossover exponents are well compatible with the universality class of the corresponding transition of homopolymers. Further strong indication of such class comes from direct comparison with the corresponding annealed problem. In 3D classical exponents are recovered. The percentage of charge sequences leading to folding in a unique ground state approaches zero exponentially with the chain length.

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