Liquid Crystal Cells with ``Dirty'' Substrates
Abstract
We explore liquid crystal order in a cell with a “dirty” substrate imposing a random surface pinning. Modeling such systems by a random-field xy model with surface heterogeneity, we find that orientational order in the three-dimensional system is marginally unstable to such surface pinning. We compute the Larkin length scale, and the corresponding surface and bulk distortions. On longer scales we calculate correlation functions using the functional renormalization group and matching methods, finding a universal logarithmic and double-logarithmic roughness in two and three dimensions, respectively. For a finite thickness cell, we explore the interplay of homogeneous-heterogeneous substrate pair and detail crossovers as a function of disorder strength and cell thickness.
- Publication:
-
Physical Review Letters
- Pub Date:
- October 2009
- DOI:
- 10.1103/PhysRevLett.103.167802
- arXiv:
- arXiv:0905.2019
- Bibcode:
- 2009PhRvL.103p7802R
- Keywords:
-
- 61.30.Dk;
- 61.30.Hn;
- 64.60.ae;
- Continuum models and theories of liquid crystal structure;
- Surface phenomena: alignment anchoring anchoring transitions surface-induced layering surface-induced ordering wetting prewetting transitions and wetting transitions;
- Renormalization-group theory;
- Condensed Matter - Soft Condensed Matter;
- Condensed Matter - Disordered Systems and Neural Networks
- E-Print:
- 4 pages, 1 figure, Published in PRL, with minor typos corrected