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29 March 2024
 
  » arxiv » cond-mat/0702662

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Poisson-Bracket Approach to the Dynamics of Bent-Core Molecules
William Kung ; M. Cristina Marchetti ;
Date 27 Feb 2007
Subject Soft Condensed Matter
AbstractWe generalize our previous work on the phase stability and hydrodynamic of polar liquid crystals possessing local uniaxial $C_{infty v}$-symmetry to biaxial systems exhibiting local $C_{2v}$-symmetry. Our work is motivated by the recently discovered examples of thermotropic biaxial nematic liquid crystals comprising bent-core mesogens, whose molecular structure is characterized by a non-polar body axis $({f{n}})$ as well as a polar axis $({f{p}})$ along the bisector of the bent mesogenic core which is coincident with a large, transverse dipole moment. The free energy for this system differs from that of biaxial nematic liquid crystals in that it contains terms violating the ${f{p}} o -{f{p}}$ symmetry. We show that, in spite of a general splay instability associated with these parity-odd terms, a uniform polarized biaxial state can be stable in a range of parameters. We then derive the hydrodynamic equations of the system, via the Poisson-bracket formalism, in the polarized state and comment on the structure of the corresponding linear hydrodynamic modes. In our Poisson-bracket derivation, we also compute the flow-alignment parameters along the three symmetry axes in terms of microscopic parameters associated with the molecular geometry of the constituent biaxial mesogens.
Source arXiv, cond-mat/0702662
Other source [GID 1098810] pmid17677474
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