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Journal of Experimental and Theoretical Physics

, Volume 107, Issue 3, pp 526–531 | Cite as

Electric-field-induced unwinding of ferroelectric helix in thin smectic C* layers with soft and rigid anchoring of molecules

  • P. V. Dolganov
  • V. M. Zhilin
  • V. K. Dolganov
  • E. I. Kats
Statistical, Nonlinear, and Soft Matter Physics
  • 43 Downloads

Abstract

The unwinding of a helical structure in thin films of a ferroelectric smectic liquid crystal (LC) by an external electric field has been theoretically studied using a discrete model in which every LC layer is characterized by a two-dimensional vector ξ i (describing the orientation of molecules) and by the polarization P i . It is established that the unwinding of the LC helix in thin films significantly differs from the well-known behavior of thick samples. In particular, discrete intermediate states (differing by an integer or half-integer number of turns) are formed in thin films for both weak and strong anchoring of molecules to a substrate surface. The physical factor responsible for this behavior is the presence of near-surface regions with thicknesses below the helix pitch and the corresponding uncompensated polarization.

PACS numbers

61.30.Cz 64.70.Md 

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References

  1. 1.
    P. G. de Gennes and J. Prost, The Physics of Liquid Crystals (Clarendon, Oxford, 1994).Google Scholar
  2. 2.
    R. D. Kamien and J. V. Selinger, J. Phys.: Condens. Matter 13, R1 (2001).CrossRefADSGoogle Scholar
  3. 3.
    S. P. Palto, Kristallografiya 48(1), 130 (2003) [Crystallogr. Rep. 48 (1), 124 (2003)].ADSGoogle Scholar
  4. 4.
    A. Michelson, L. Benguigui, and D. Cabib, Phys. Rev. A: At., Mol., Opt. Phys. 16, 394 (1977).ADSGoogle Scholar
  5. 5.
    H. Takezoe, K. Furuhata, T. Nakagiri, et al., J. Appl. Phys. 17, 1219 (1978).CrossRefGoogle Scholar
  6. 6.
    S. A. Pikin and V. L. Indenbom, Usp. Fiz. Nauk 125, 251 (1978) [Sov.-Phys. Usp. 21, 487 (1978)].Google Scholar
  7. 7.
    V. E. Dmitrienko and V. A. Belyakov, Zh. Éksp. Teor. Fiz. 78(4), 1568 (1980) [Sov. Phys. JETP 51 (4), 787 (1980)].Google Scholar
  8. 8.
    N. Baytch, R. L. B. Selinger, J. V. Selinger, and R. Shashidhar, Phys. Rev. E: Stat., Nonlinear, Soft Matter Phys. 68, 041702 (2003).Google Scholar
  9. 9.
    V. A. Belyakov and E. I. Kats, Zh. Éksp. Teor. Fiz. 120(2), 430 (2001) [JETP 93 (2), 380 (2001)].Google Scholar
  10. 10.
    H. Sun, H. Orihara, and Y. Ishibashi, J. Phys. Soc. Jpn. 62, 2706 (1993).CrossRefADSGoogle Scholar
  11. 11.
    M. Čepič and B. Žekš, Mol. Cryst. Liq. Cryst. Sci. Technol., Sect. A 263, 61 (1995).CrossRefGoogle Scholar
  12. 12.
    T. Qian and P. L. Taylor, Phys. Rev. E: Stat. Phys., Plasmas, Fluids, Relat. Interdiscip. Top. 60, 2978 (1999).Google Scholar
  13. 13.
    A. Roy and N. V. Madhusudana, Eur. Phys. J., E 1, 319 (2000).Google Scholar
  14. 14.
    M. Čepič and B. Žek, Phys. Rev. Lett. 87, 085501 (2001).Google Scholar
  15. 15.
    L. A. Parry-Jones and S. J. Elston, Phys. Rev. E: Stat. Phys., Plasmas, Fluids, Relat. Interdiscip. Top. 63, 050701(R) (2001).Google Scholar
  16. 16.
    P. V. Dolganov, V. M. Zhilin, V. K. Dolganov, and E. I. Kats, Phys. Rev. E: Stat. Nonlinear, Soft Matter Phys. 67, 041716 (2003).Google Scholar
  17. 17.
    I. E. Dzyaloshinskioe, Zh. Éksp. Teor. Fiz. 46, 1420 (1964) [Sov. Phys. JETP 19, 960 (1964)].Google Scholar
  18. 18.
    Yu. A. Izyumov, Usp. Fiz. Nauk 144, 439 (1984) [Sov.-Phys. Usp. 27, 845 (1984)].Google Scholar
  19. 19.
    P. Pieranski, L. Beliard, J.-Ph. Tournellec, et al., Physica A (Amsterdam) 194, 364 (1993).ADSGoogle Scholar

Copyright information

© Pleiades Publishing, Ltd. 2008

Authors and Affiliations

  • P. V. Dolganov
    • 1
  • V. M. Zhilin
    • 1
  • V. K. Dolganov
    • 1
  • E. I. Kats
    • 2
    • 3
  1. 1.Institute of Solid State PhysicsRussian Academy of SciencesChernogolovka, Moscow oblastRussia
  2. 2.Laue-Langevin InstituteGrenobleFrance
  3. 3.Landau Institute for Theoretical PhysicsRussian Academy of SciencesMoscowRussia

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