Journal
PHYSICAL REVIEW E
Volume 68, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.68.031502
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We investigate an extension of the lattice model of melting of semiflexible polymers originally proposed by Flory. Along with a bending penalty epsilon, present in the original model and involving three sites of the lattice, we introduce an interaction energy epsilon(p), corresponding to the presence of a pair of parallel bonds and an interaction energy epsilon(h), associated with a hairpin turn. Both these new terms represent four-site interactions. The model is solved exactly on a Husimi cactus, which approximates a square lattice. We study the phase diagram of the system as a function of the energies. For a proper choice of the interaction energies, the model exhibits a first-order melting transition between a liquid and a crystalline phase at a temperature T-M. The continuation of the liquid phase below T-M gives rise to a supercooled liquid, which turns continuously into a new low-temperature phase, called metastable liquid, at T-MC
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