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Core hysteresis in nematic defects.

Samo Kralj1, Epifanio G Virga

  • 1Laboratory of Physics of Complex Systems, Faculty of Education, University of Maribor, Koroska 160, 2000 Maribor, Slovenia.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 21, 2002
PubMed
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Field-induced transformations in nematic disclinations were studied. Researchers observed hysteresis in the uniaxial sheath position, analogous to phenomena in point defects, offering insights into liquid crystal behavior.

Area of Science:

  • Liquid Crystal Physics
  • Soft Matter Physics
  • Materials Science

Background:

  • Nematic disclinations exhibit complex structures under external fields.
  • Understanding field-induced transformations is crucial for controlling liquid crystal phases.

Purpose of the Study:

  • To investigate field-induced structural changes in nematic disclinations.
  • To analyze the behavior of the uniaxial sheath and its hysteresis.
  • To compare line defect behavior with point defect structures.

Main Methods:

  • Employing the Landau-de Gennes order tensor parameter (Q).
  • Analyzing defectless escaped radial structures and line defect structures.
  • Investigating hysteresis in the uniaxial sheath position.

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Main Results:

  • The critical field for transition increases with cylinder radius (R).
  • Hysteresis in the uniaxial sheath position was observed, with two distinct solutions.
  • The uniaxial sheath behavior is analogous to the uniaxial ring in point defects.

Conclusions:

  • Field strength significantly influences nematic disclination structures.
  • Hysteresis in the uniaxial sheath is a key characteristic of line defects.
  • Similar hysteresis phenomena are expected in point defect cores.