Approach and rotation of reconnecting topological defect lines in liquid crystal

Zushi, Yohei; Schimming, Cody D.; Takeuchi, Kazumasa A.

doi:10.1103/PhysRevResearch.6.023284

Title: Approach and rotation of reconnecting topological defect lines in liquid crystal

Journal Article · 17 June 2024 · Physical Review Research

DOI: https://doi.org/10.1103/PhysRevResearch.6.023284 · OSTI ID:2373356

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Topological defects are a universal concept across many disciplines, such as crystallography, liquid-crystalline physics, low-temperature physics, cosmology, and even biology. In nematic liquid crystals, topological defects called disclinations have been widely studied. For their three-dimensional (3D) dynamics, however, only recently have theoretical approaches dealing with fully 3D configurations been reported. Further, recent experiments have observed 3D disclination line reconnections, a phenomenon characteristic of defect line dynamics, but detailed discussions were limited to the case of approximately parallel defects. In this paper, we focus on the case of two disclination lines that approach at finite angles and lie in separate planes, a more fundamentally 3D reconnection configuration. Observing and analyzing such reconnection events, we find the square-root law of the distance between disclinations and the decrease of the interdisclination angle over time. We compare the experimental results with theory and find qualitative agreement on the scaling of distance and angle with time, but quantitative disagreement on distance and angle relative mobilities. To probe this disagreement, we derive the equations of motion for systems with reduced twist constant and also carry out simulations for this case. These, together with the experimental results, suggest that deformations of disclinations may be responsible for the disagreement. Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE

OSTI ID:: 2373356

Journal Information:: Physical Review Research, Journal Name: Physical Review Research Journal Issue: 2 Vol. 6; ISSN 2643-1564; ISSN PPRHAI

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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