Ground states of two-dimensional polyampholytes

Eilon Brenner, Yacov Kantor

Research output: Contribution to journalArticlepeer-review


We perform an exact enumeration study of polymers formed from a (quenched) random sequence of charged monomers [Formula Presented], restricted to a two-dimensional square lattice. Monomers interact via a logarithmic (Coulomb) interaction. We study the ground-state properties of the polymers as a function of their excess charge [Formula Presented] for all possible charge sequences up to a polymer length [Formula Presented]. We find that the ground state of the neutral ensemble is compact and its energy extensive and self-averaging. The addition of a small excess charge causes an expansion of the ground state with the monomer density depending only on [Formula Presented]. In an annealed ensemble the ground state is fully stretched for any excess charge [Formula Presented].

Original languageEnglish
Pages (from-to)5278-5283
Number of pages6
JournalPhysical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Issue number5
StatePublished - 1997


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