Order reconstruction phenomena and temperature-driven dynamics in a 3D zenithally bistable device
1 Oxford Centre for Collaborative Applied Mathematics, University of Oxford - Oxford, OX1 3LB, UK
2 Department of Mathematical Sciences, University of Bath - Bath, BA2 7AY, UK
Received: 9 December 2013
Accepted: 12 June 2014
We model the zenithally bistable device (ZBD) in three dimensions (3D), within the Landau-de Gennes theory, and find three stable static states in 3D without an applied field: the vertically aligned nematic (VAN) state, the hybrid aligned nematic (HAN) state and a third, high-tilt state, which we call the THAN state, with an interior and a surface defect. We recover the order reconstruction (OR) phenomenon around the defects in the HAN and THAN states and the 3D THAN and HAN solutions exhibit stable biaxial cylinders connecting defects on opposite faces of the ZBD device. We demonstrate a two-way temperature-driven switching between high-tilt and low-tilt states through controlled heating and cooling procedures in two dimensions (2D), with no applied fields.
PACS: 61.30.Jf – Defects in liquid crystals / 02.30.Jr – Partial differential equations / 42.79.Kr – Display devices, liquid-crystal devices
© EPLA, 2014