Regensburg 2022 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 46: Poster Session: Complex Fluids, Soft Matter, Active Matter, Glasses and Granular Materials
DY 46.2: Poster
Donnerstag, 8. September 2022, 15:00–18:00, P2
Topological fine structure of smectic grain boundaries and tetratic disclination lines within three dimensional smectic liquid crystals* — Paul A. Monderkamp1, René Wittmann1, •Michael te Vrugt2, Axel Voigt3, Raphael Wittkowski2, and Hartmut Löwen1 — 1Institut für Theoretische Physik II: Weiche Materie, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, 40225 Düsseldorf, Germany — 2Institut für Theoretische Physik, Center for Soft Nanoscience, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany — 3Institut für Wissenschaftliches Rechnen, Technische Universität Dresden, 01062 Dresden, Germany
Based on recent insights into the orientational topology of smectic grain boundaries in two dimensions, we analyse boundaries in three-dimensional confined smectics from the perspective of tetratic symmetry. Monte-Carlo simulations show the emergence of orientational grain boundaries. Using a 3d tetratic order parameter constructed from the Nelson-Steinhardt invariants, we show that the orientational topological fine structure of the planar smectic grain boundaries can be interpreted as a pair of tetratic disclination lines that are located on the edges of the nematic domain boundary [1]. Thereby, we shed light on the fine structure of the orientational topology of grain boundaries in three-dimensional confined smectics.
[1] P. A. Monderkamp et al., Phys. Chem. Chem. Phys. (2022), https://doi.org/10.1039/D2CP00060A
*Funded by the Deutsche Forschungsgemeinschaft (DFG) – grants VO 899/19-2, WI 4170/3-1, and LO 418/20-2.