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Surface states in nearly modulated systems.

A E Jacobs1, D Mukamel, D W Allender

  • 1Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|April 20, 2001
PubMed
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This study explores surface ordering in magnetic and cholesteric liquid crystals near a Lifshitz point. It identifies three distinct surface layer behaviors, including a novel nonmonotonic decaying layer unique to specific phase boundaries.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Soft Matter Physics

Background:

  • Understanding the surface phase behavior of liquid crystals is crucial for their technological applications.
  • The Lifshitz point signifies a critical transition between modulated and homogeneous bulk phases in magnetic and cholesteric systems.
  • Existing models often simplify surface interactions, necessitating a more comprehensive approach.

Purpose of the Study:

  • To investigate the surface layer phase behavior of magnetic and cholesteric liquid crystals.
  • To analyze systems at or near a Lifshitz point using an advanced Landau model.
  • To characterize distinct surface ordering phenomena, including novel nonwetting layers.

Main Methods:

  • Utilized a Landau model incorporating surface and bulk fields.

Related Experiment Videos

  • Included a free energy term proportional to the square of the second derivative of the order parameter.
  • Analyzed the system's behavior in the limit of vanishing bulk field.

    • Main Results:

    • Identified three distinct types of surface ordering: a wetting layer and two types of nonwet layers.
    • Characterized a nonwet layer with a large deviation from bulk order that decays nonmonotonically.
    • This large deviation nonwet layer is a specific feature of systems at the Lifshitz point or with homogeneous bulk phases.

    Conclusions:

    • The Landau model provides a detailed description of surface ordering in liquid crystals near phase transitions.
    • The discovery of a nonmonotonic decaying nonwet layer offers new insights into surface phenomena at Lifshitz points.
    • These findings are significant for understanding and manipulating the properties of liquid crystal interfaces.