University of Cambridge > Talks.cam > DAMTP Statistical Physics and Soft Matter Seminar > Three-Dimensional Active Defect Loops

Three-Dimensional Active Defect Loops

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  • UserGareth Alexander, Warwick
  • ClockTuesday 05 May 2020, 13:00-14:00
  • HouseMR11, CMS.

If you have a question about this talk, please contact Professor Mike Cates.

We describe the flows and morphological dynamics of topological defect lines and loops in three-dimensional active nematics and show, using theory and numerical modelling, that they are governed by the local profile of the orientational order surrounding the defects. Analysing a continuous span of defect loop profiles, ranging from radial and tangential twist to wedge ±1/2 profiles, we show that the distinct geometries can drive material flow perpendicular or along the local defect loop segment, whose variation around a closed loop can lead to net loop motion, elongation, or compression of shape, or buckling of the loops. We demonstrate a correlation between local curvature and the local orientational profile of the defect loop, indicating dynamic coupling between geometry and topology. To address the general formation of defect loops in three dimensions, we show their creation via bend instability from different initial elastic distortions.

This talk is part of the DAMTP Statistical Physics and Soft Matter Seminar series.

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