Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 20: Poster Session I
CPP 20.46: Poster
Montag, 12. März 2018, 17:30–19:30, Poster A
Electrostatic bending response of a helical chain of charges — •Alexandra Zampetaki1, Jan Stockhofe1, and Peter Schmelcher1,2 — 1Zentrum für Optische Quantentechnologien, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany
We explore the electrostatic contribution to the bending response of a chain of identical charged particles confined on a finite helical filament. We analyse how the energy difference Δ E between the bent and the unbent helical chain scales with the length of the helical segment and the radius of curvature and identify features that are not captured by the standard notion of the bending rigidity, normally used as a measure of bending tendency in the linear response regime. Using instead Δ E to characterize the bending response of the helical chain for low values of the radius-to-pitch ratio we find that it exhibits interesting oscillations with the number of particles, encountered for commensurate fillings. These oscillations yield length-dependent oscillations in the preferred bending direction of the helical chain of charges. We show that the origin of such oscillations is the non-uniformity of the charge distribution caused by the long-range character of the Coulomb interactions and the finite length of the chain.