Reviews of topical problems

Topological defects in active liquid crystals

Departments of Biomedical Engineering, Chemistry and Mathematics, Pennsylvania State University, 205 Hallowell Building, University Park, PA, 16802-4400, USA

A wide class of out-of-equilibrium systems comprised of interacting self-propelled agents is termed active matter. The most relevant examples include suspensions of microscopic swimming organisms (bacteria, sperm cells, or unicellular algae), synthetic catalytic nanomotors, colloidal self-propelled Janus particles, and even macroscopic bird flocks, fish schools, or human crowds. The simplest and most studied realization of active matter is a suspension of microscopic swimmers, such as motile microorganisms or self-phoretic colloids. A liquid crystal, a highly-structured anisotropic environment with local molecular ordering, "doped" by a small amount of active component yields an interesting class of non-equilibrium materials with novel optical and mechanical properties. Singularities of local molecular orientation, or topological defects, play an important role in the spatiotemporal organization of active liquid crystals. This study surveys the most recent experimental and theoretical advances in the field of active liquid crystals and highlights connections with other nonequilibrium physical and biological systems.

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Fulltext is also available at DOI: 10.3367/UFNe.2018.10.038433
Keywords: microswimmers, liquid crystals, topological defects, active matter, collective motion
PACS: 42.70.Df, 47.20.−k, 47.63.Gd (all)
DOI: 10.3367/UFNe.2018.10.038433
Citation: Aranson I S "Topological defects in active liquid crystals" Phys. Usp. 62 892–909 (2019)
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Received: 7th, July 2018, revised: 22nd, September 2018, 4th, October 2018

Оригинал: Арансон И С «Топологические дефекты в активных жидких кристаллах» УФН 189 955–975 (2019); DOI: 10.3367/UFNr.2018.10.038433

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