Numerical Simulation of the TGB Phase of Chiral Liquid Crystals

Abstract

We numerically minimized the Landau-de Gennes free energy to investigate the layer structure of the twist-grain boundary (TGB) phase of chiral liquid crystals. We compare the obtained structure with Scherk's minimial surface. For large twist angles, an unlocking of the director and the layer orientation reduces the effective layer bending rigidity, which causes a large deviation of the mean curvature from zero. At temperatures close to the TGB-cholesteric transition, we find a melting of the smectic layers in the whole grain boundary.

Keywords:

• chiral liquid crystal
• defect structure
• minimal surface
• twist-grain-boundary

Acknowledgments

Tha authors submit the manuscript for publication in the proceedings of the 21st International Liquid Crystal Conference. The manuscript has not been published elsewhere and it has not been submitted simultaneously for publication elsewhere.