Force-induced unfolding of a homopolymer on fractal lattice: exact results vs. mean field predictions

Details Force-induced unfolding of a homopolymer on fractal lattice: exact results vs. mean field predictions Force-induced unfolding of a homopolymer on fractal lattice: exact results vs. mean field predictions

2002-02-14

arxiv.org/abs/cond-mat/0202236v1

J. Phys. A 35, L233 (2002).

Physics

Condensed Matter

Statistical Mechanics

15 pages, 5 eps figures

Scientific paper

10.1088/0305-4470/35/18/101

We study the force-induced unfolding of a homopolymer on the three dimensional Sierpinski gasket. The polymer is subject to a contact energy between nearest neighbour sites not consecutive along the chain and to a stretching force. The hierarchical nature of the lattice we consider allows for an exact treatment which yields the phase diagram and the critical behaviour. We show that for this model mean field predictions are not correct, in particular in the exact phase diagram there is {\em not} a low temperature reentrance and we find that the force induced unfolding transition below the theta temperature is second order.

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