Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
1998-07-09
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.
Monari Pietro
Stella Attilio L.
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