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Defect dynamics in a smectic Grandjean-Cano wedge.

Christophe Blanc¹, Nadia Zuodar, Ioannis Lelidis

¹GDPC CNRS, Université de Montpellier-II, CC026, Place Eugène Bataillon, F-34095 Montpellier Cedex 05, France. blanc@gdpc.univ-montp2.fr

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|March 5, 2004

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Edge dislocation dynamics in liquid crystals were studied under deformation. Screw dislocations form edge dislocation loops, revealing insights into defect interactions and mobility regimes.

Area of Science:

Condensed Matter Physics
Soft Matter Physics
Liquid Crystal Science

Background:

Edge dislocations spontaneously form in Grandjean-Cano wedges filled with smectic liquid crystals.
These defects are observable near the smectic A to smectic C phase transition.

Purpose of the Study:

To investigate the dynamics of edge dislocations under controlled deformation (dilation and compression).
To characterize dislocation mobility regimes and understand defect interactions.

Main Methods:

Controlled mechanical deformation (dilation and compression) of liquid crystal samples.
Microscopic observation and analysis of dislocation behavior.
Theoretical modeling of defect interactions and mobility.

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Main Results:

Several regimes of dislocation mobility were identified with increasing strain and strain rate.
Interactions between screw and edge dislocations were correlated with observed mobility.
Screw dislocations were shown to nucleate loops of edge dislocations under sufficient strain, supporting the helical instability model.

Conclusions:

The study elucidates the complex dynamics and interactions of dislocations in smectic liquid crystals.
Findings provide a stronger basis for models of loop nucleation by screw dislocations.
Further discussion on the microscopic origins of defect interactions is presented.