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Pseudo-Casimir force in chiral smectic liquid crystals.

B Markun1, S Zumer

  • 1Department of Physics, University of Ljubljana, Jadranska 19, SI-1000 Ljubljana, Slovenia. bostjan@fiz.uni.lj.si

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 4, 2003
PubMed
Summary

We theoretically studied the pseudo-Casimir force in chiral smectic systems. The force

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Area of Science:

  • Condensed matter physics
  • Liquid crystal physics

Background:

  • The pseudo-Casimir force arises from orientational order fluctuations.
  • Chiral smectic liquid crystals exhibit complex phase behaviors.

Purpose of the Study:

  • To theoretically investigate the pseudo-Casimir force in chiral smectic systems.
  • To analyze the force's dependence on fluctuation modes and boundary conditions.

Main Methods:

  • Theoretical modeling of orientational order fluctuations.
  • Analysis of boundary conditions in homeotropic cells and free-standing films.

Main Results:

  • The pseudo-Casimir force's character depends on fluctuation modes and boundary conditions.
  • Near the smectic-A* to smectic-C* phase transition, the force diverges if the system is frustrated.
  • The force remains finite if the system is not frustrated.

Conclusions:

  • The pseudo-Casimir interaction in chiral smectic systems is universal, analogous to nematic systems.
  • Understanding this force is crucial for chiral liquid crystal applications.

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