Buckling instability for a charged and fluctuating semiflexible polymer

摘要

In this article we address the problem of Euler's buckling instability in acharged semi-flexible polymer that is under the action of a compressive force.We consider this instability as a phase transition and investigate the role ofthermal fluctuations in the buckling critical force. By performing moleculardynamic simulations, we show that the critical force decreases when thetemperature increases. Repulsive electrostatic interaction in the finitetemperature is in competition with thermal fluctuations to increase thebuckling threshold.