Triple minima in free energy of semiflexible polymers

Details Triple minima in free energy of semiflexible polymers Triple minima in free energy of semiflexible polymers

2002-03-23

arxiv.org/abs/cond-mat/0203482v2

Phys. Rev. Lett., 89, 065502 (2002)

Physics

Condensed Matter

Soft Condensed Matter

Published version, 4 pages, 5 figures, revtex

Scientific paper

10.1103/PhysRevLett.89.065502

We study the free energy of the worm-like-chain model, in the constant-extension ensemble, as a function of the stiffness for finite chains of length L. We find that the polymer properties obtained in this ensemble are "qualitatively" different from those obtained using constant-force ensembles. In particular we find that as we change the stiffness parameter, the polymer makes a transition from the flexible to the rigid phase and there is an intermediate regime of parameter values where the free energy has three minima and both phases are stable. This leads to interesting features in the force-extension curves.

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