TY - JOUR

T1 - Ground states of two-dimensional polyampholytes

AU - Brenner, Eilon

AU - Kantor, Yacov

PY - 1997

Y1 - 1997

N2 - 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].

AB - 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].

UR - http://www.scopus.com/inward/record.url?scp=6444233686&partnerID=8YFLogxK

U2 - 10.1103/PhysRevE.56.5278

DO - 10.1103/PhysRevE.56.5278

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AN - SCOPUS:6444233686

SN - 1063-651X

VL - 56

SP - 5278

EP - 5283

JO - Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics

JF - Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics

IS - 5

ER -