Journal
PHYSICAL REVIEW E
Volume 73, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.73.031708
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Starting from a microscopic definition of an alignment vector proportional to the polarization, we discuss the hydrodynamics of polar liquid crystals with local C-infinity v symmetry. The free energy for polar liquid crystals differs from that of nematic liquid crystals (D-infinity h) in that it contains terms violating the n ->-n symmetry. First we show that these Z(2)-odd terms induce a general splay instability of a uniform polarized state in a range of parameters. Next we use the general Poisson-bracket formalism to derive the hydrodynamic equations of the system in the polarized state. The structure of the linear hydrodynamic modes confirms the existence of the splay instability.
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