Defect Spirograph: Dynamical Behavior of Defects in Spatially Patterned Active Nematics.

@article{Mozaffari2021DefectSD,
  title={Defect Spirograph: Dynamical Behavior of Defects in Spatially Patterned Active Nematics.},
  author={Ali Mozaffari and Rui Zhang and Noe Atzin and Juan J. de Pablo},
  journal={Physical review letters},
  year={2021},
  volume={126 22},
  pages={
          227801
        }
}
Topological defects in active liquid crystals can be confined by introducing gradients of activity. Here, we examine the dynamical behavior of two defects confined by a sharp gradient of activity that separates an active circular region and a surrounding passive nematic material. Continuum simulations are used to explain how the interplay among energy injection into the system, hydrodynamic interactions, and frictional forces governs the dynamics of topologically required self-propelling +1/2… 
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