Ferrielectric smectic phase with a layer-by-layer change of the two-component order parameter

JETP Letters

Volumn 87, Issue 5, 2008, Pages 253-257

  Dolganov, P V ^a   Zhilin, V M ^a   Dolganov, V K ^a   Kats, E I ^b,c  

^a INSTITUTE OF SOLID STATE PHYSICS   (Russian Federation)

^b INSTITUT LAUE LANGEVIN   (France)

^c LANDAU INSTITUTE FOR THEORETICAL PHYSICS   (Russian Federation)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 43949087866     PISSN: 00213640     EISSN: 10906487     Source Type: Journal    
DOI: 10.1134/S0021364008050068     Document Type: Article

References (29)

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19. A possible mechanism for the coupling between the tilt and the polarization p is the following. In an environment with mirror symmetry (SmA phase) at any particular moment, the molecules have with equal probability left-or right-handed conformations, i.e., the molecules on average are nonchiral. The collective molecular tilt breaks the mirror symmetry, so that left-and righthanded conformations are no longer equiprobable. To describe chiral, tilted, and polar smectics from the macroscopic symmetry point of view, one has to introduce three order parameters χ, ξ, and p, respectively. Note that these order parameters are not independent, and condensation of any pair of them, inevitably induces the nonzero value for the third one. This fact leads to the presence of the specific third order term (the product of these order parameters). In principle, one can include the dipole smectic layer polarization as a secondary order parameter in our model, and polar orientational order parameter configurations also imply electrical polarity. The nonuniform orientational deformations in such a case should produce space charges and long range Coulomb interaction. In reality, however, the molecules involved may have large steric anisotropy, without a large electric dipole moment. Moreover, ionic impurities can screen the Coulomb interaction. Thus, we disregard electrostatics in this paper.
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