Europhys. Lett., 75 (5), pp. 818-824 (2006)
DOI: 10.1209/epl/i2006-10170-1

Stretching a self-interacting semiflexible polymer

A. Rosa¹, D. Marenduzzo² and S. Kumar<sup>1, 3

1</sup>  Max-Planck Institut für Physik komplexer Systeme - Nöthnitzer Strasse 38 01187 Dresden, Germany
²  School of Physics, SUPA, University of Edinburgh - Edinburgh EH9 3JZ, UK
³  Department of Physics, Banaras Hindu University - Varanasi 221005, India

received 10 May 2006; accepted in final form 10 July 2006
published online 28 July 2006

Abstract
We present results from three-dimensional off-lattice Monte Carlo simulations to investigate the stretching response of a semi-flexible polymer subjected to self-attractive interactions. We employ the quasi-static approximation and consider both the fixed elongation and the fixed force ensemble, which can equally well be reproduced in experiments nowadays. The force vs. elongation curves are in general non-monotonic, and the quantity and height of peaks increase with decreasing temperature, and with increasing stiffness. We finally compute the variation of unfolding force with temperature. Our results should be relevant for stretching experimental studies, and for more refined theoretical modeling, taking non-equilibrium and kinetic effects into account.

PACS
82.35.Lr - Physical properties of polymers.
87.15.-v - Biomolecules: structure and physical properties.

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