title: Helicoid to spiral ribbon transition.
abstract: We present a continuum description for the transition between the helicoid and spiral ribbon structures of chiral materials. At a critical value of the ratio between the bending and stretching moduli, the Föppl-von Kármán number, we encounter a continuous buckling transition from a straight helicoid to a spiral ribbon. Two of the three persistence lengths of the ribbon become very short at the transition point, indicating strong thermal shape fluctuations. The transition is discontinuous if the ribbon width is treated as a free thermodynamic variable.
authors.affiliation: Department of Physics and Astronomy, University of California, Los Angeles, California 90025, USA.
authors.forename: Rouzbeh
authors.initials: R
authors.lastname: Ghafouri
authors.forename: Robijn
authors.initials: R
authors.lastname: Bruinsma
mesh_terms: D001704:Biopolymers / Q000737:chemistry*; D008956:Models, Chemical; D008968:Molecular Conformation; D009010:Monte Carlo Method; D013237:Stereoisomerism; D013816:Thermodynamics
chemical_list: D001704:Biopolymers