Topological Inclusions in 2D Smectic-C Films

Details Topological Inclusions in 2D Smectic-C Films Topological Inclusions in 2D Smectic-C Films

1998-05-29

arxiv.org/abs/cond-mat/9805403v1

Physics

Condensed Matter

Soft Condensed Matter

10 REVTEX pages, 4 figures

Scientific paper

In thin films of smectic-C liquid crystals, localized regions containing additional smectic layers form circular inclusions that carry a topological charge. Such inclusions nucleate a companion topological defect. These inclusion-defect pairs are modeled as topological dipoles within the context of a one-coupling constant approximation to the 2D Frank free energy. Deviations of the dipole direction from a preferred orientation cause the dipoles to acquire a logarithmic charge. Thermal fluctuations of the dipole direction are calculated and found to be large, scaling as the logarithm of the system size. In addition to dipole-dipole interactions arising from the topological charges, we also find that the thermal fluctuations of the dipole directions are coupled through a preference for global charge neutrality of the logarithmic charges.

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