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Defect-enhanced nematic surface order reconstruction.

Milan Ambrozic1, Samo Kralj, Epifanio G Virga

  • 1Engineering Ceramics Department, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|May 16, 2007
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Summary
This summary is machine-generated.

An electric field can expel nematic line defects from hybrid cells. Before expulsion, the defect core dramatically changes, broadening and merging into a surface layer, indicating nematic order reconstruction.

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Area of Science:

  • Soft Matter Physics
  • Liquid Crystal Science

Background:

  • Nematic line defects with topological charge M=+/-1/2 exist in hybrid cells.
  • The behavior of these defects under external fields is not fully understood.

Purpose of the Study:

  • To investigate the influence of an applied electric field on nematic line defects in a hybrid cell.
  • To explore the biaxial structure of the defect core and its response to the electric field.

Main Methods:

  • Utilizing the Landau-de Gennes phenomenological theory.
  • Simulating the behavior of a nematic line defect under an applied electric field (Ea).

Main Results:

  • The electric field causes the expulsion of the nematic line defect from the cell.
  • Prior to expulsion, the defect core undergoes significant structural changes, including broadening and merging into a surface layer with high biaxiality.
  • This transition signifies a reconstruction of the nematic order.

Conclusions:

  • Applied electric fields can dramatically alter the structure and position of nematic line defects.
  • The observed order reconstruction in the defect core mirrors phenomena seen in the bulk nematic phase.
  • Similar order reconstruction may occur in defect-free systems at higher electric field thresholds.