Dresden 2009 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: POSTERS Polymer Physics

CPP 13.25: Poster

Dienstag, 24. März 2009, 14:00–16:30, P3

Multistage switching in bent-core smectic liquid crystal: Experiment and theory — •Stephan Stern, Alexey Eremin, and Ralf Stannarius — Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, D-39106 Magdeburg

We describe a novel type of switching behavior in a series of homologuous bent-core liquid crystal compounds in external dc electric fields. This kind of switching is distinguished by the occurrence of an intermediate field-induced ferrielectric state between an antiferroelectric ground state (off-state) and a ferroelectric on-state. Here we present the results of Second-Harmonic-Generation (SHG) experiments on those compounds, propose a structure for the ground state and the field induced states and develop a simple Ising-type model which can account for the unusual switching behaviour.

S. Findeisen et al., EPJ (2008)