Density of States for a Short Overlapping-Bead Polymer: Clues to a Mechanism for Helix Formation?

Details Density of States for a Short Overlapping-Bead Polymer: Clues to a Mechanism for Helix Formation? Density of States for a Short Overlapping-Bead Polymer: Clues to a Mechanism for Helix Formation?

2008-08-19

arxiv.org/abs/0808.2559v1

Physics

Condensed Matter

Statistical Mechanics

Accepted to Physical Reviw E

Scientific paper

10.1103/PhysRevE.78.031803

The densities of states are evaluated for very short chain molecules made up of overlapping monomers, using a model which has previously been shown to produce helical structure. The results of numerical calculations are presented for tetramers and pentamers. We show that these models demonstrate behaviors relevant to the behaviors seen in longer, helix forming chains, particularly, "magic numbers" of the overlap parameter where the derivatives of the densities of states change discontinuously, and a region of bimodal energy probability distributions, reminiscent of a first order phase transition in a bulk system.

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