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Title: Electric-field-induced unwinding of ferroelectric helix in thin smectic C* layers with soft and rigid anchoring of molecules

The unwinding of a helical structure in thin films of a ferroelectric smectic liquid crystal (LC) by an external electric field has been theoretically studied using a discrete model in which every LC layer is characterized by a two-dimensional vector {xi}{sub i} (describing the orientation of molecules) and by the polarization P{sub i}. It is established that the unwinding of the LC helix in thin films significantly differs from the well-known behavior of thick samples. In particular, discrete intermediate states (differing by an integer or half-integer number of turns) are formed in thin films for both weak and strong anchoring of molecules to a substrate surface. The physical factor responsible for this behavior is the presence of near-surface regions with thicknesses below the helix pitch and the corresponding uncompensated polarization.
Authors:
; ;  [1] ;  [2]
  1. Russian Academy of Sciences, Institute of Solid State Physics (Russian Federation)
  2. Laue-Langevin Institute (France)
Publication Date:
OSTI Identifier:
21241929
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Experimental and Theoretical Physics; Journal Volume: 107; Journal Issue: 3; Other Information: DOI: 10.1134/S1063776108090203; Copyright (c) 2008 Pleiades Publishing, Ltd; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ELECTRIC FIELDS; FERROELECTRIC MATERIALS; INTERMEDIATE STATE; LAYERS; LIQUID CRYSTALS; MOLECULES; ORIENTATION; POLARIZATION; SUBSTRATES; THIN FILMS; TWO-DIMENSIONAL CALCULATIONS