Issue
EPL
Volume 80, Number 1, October 2007
Article Number 16004
Number of page(s) 6
Section Condensed Matter: Structural, Mechanical and Thermal Properties
DOI http://dx.doi.org/10.1209/0295-5075/80/16004
Published online 11 September 2007
EPL, 80 (2007) 16004
DOI: 10.1209/0295-5075/80/16004

A bilayer model for the chevron structures in surface-stabilised antiferroelectric liquid crystals

A. Roy

Raman Research Institute - C. V. Raman Avenue, Sadashivanagar, Bangalore 560 080, India

aroy@rri.res.in

received 4 May 2007; accepted in final form 17 August 2007; published October 2007
published online 11 September 2007

Abstract
We propose a bilayer model to describe the chevron structures in the surface-stabilized antiferroelectric liquid-crystalline phase or in the anticlinic smectic C (SmCA) phase. We show that i) the chevron structures in the SmCA phase can have three arms as has been observed in some experiments in contrast to the two-arm chevron structures usually found in synclinic smectic C (SmC) phase; ii) surface interactions can stabilize the SmC phase even for compounds which do not exhibit SmC phase in the bulk. For such compounds, we compute the phase diagram in the temperature vs. cell thickness parameter plane and predict a triple point where smectic A phase, SmCA phase and surface-induced SmC phase can coexist.

PACS
61.30.Cz - Molecular and microscopic models and theories of liquid crystal structure.
61.30.Jf - Defects in liquid crystals.
64.70.Md - Transitions in liquid crystals.

© Europhysics Letters Association 2007