Nature of the Collapse Transition for Polymers

JURGEN F. STILCK; K.D. MACHADO; PABLO SERRA

PHYSICAL REVIEW LETTERS

AMER PHYSICAL SOC

Lugar: New York; Año: 1996 vol. 76 p. 2734 - 2737

0031-9007

We solve models for self-avoiding walks on Husimi lattices of coordination number q ­=2 (sigma+ 1), sigma= ­ 1, 2, . . . made up of squares. An attractive interaction is introduced between first-neighborsites incorporated into the walk or between bonds on opposite edges of elementary squares. For s . 1one polymerized phase is present in the phase diagram and the Q point is a tricritical point. For s ­ 1,however, two distinct polymerized phases appear, and the Q point is a tricritical point (attractive sites)or a critical end point (attractive bonds).