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The European Physical Journal E

, Volume 20, Issue 3, pp 257–266 | Cite as

Splay-bend textures involving tetrahedratic order

  • H. Pleiner
  • P. E. CladisEmail author
  • H. R. Brand
Regular Article

Abstract.

We show that defect-free splay-bend textures are less energetic compared to uniform states in liquid-crystalline phases that possess both quadrupolar (nematic) and octupolar (tetrahedratic) order. This is because, in such systems, there is a symmetry-allowed linear gradient term in the energy. Another unusual feature of these splay-bend textures is the fact that they have a non-homogeneous, space-dependent free-energy density. These results may help clarify some mysterious features noted for the B7 liquid-crystal phase formed by achiral banana-shaped molecules.

PACS.

61.30.Gd Orientational order of liquid crystals; electric and magnetic field effects on order 61.30.Dk Continuum models and theories of liquid crystal structure 05.70.Ln Nonequilibrium and irreversible thermodynamics 

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Copyright information

© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2006

Authors and Affiliations

  1. 1.Max-Planck-Institute for Polymer ResearchMainzGermany
  2. 2.Advanced Liquid Crystal TechnologiesSummitUSA
  3. 3.Theoretische Physik IIIUniversität BayreuthBayreuthGermany

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