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Area of Science:

  • Soft Matter Physics
  • Active Matter Systems
  • Liquid Crystal Dynamics

Background:

  • Topological defects in active liquid crystals are influenced by activity gradients.
  • Confining defects is crucial for controlling active matter behavior.

Purpose of the Study:

  • To investigate the dynamics of topological defects (+1/2 defects) confined by sharp activity gradients.
  • To understand the governing factors of defect motion in active nematic systems.

Main Methods:

  • Utilized continuum simulations to model defect behavior.
  • Analyzed the interplay of energy injection, hydrodynamic interactions, and frictional forces.

Main Results:

  • Developed a phase diagram mapping defect dynamics based on activity and frictional damping.
  • Identified distinct dynamical modes: immobile, rotating, bouncing, cruising, dancing, and irregular multi-defect dynamics.

Conclusions:

  • Activity gradients effectively confine and control topological defects in active liquid crystals.
  • The diverse dynamical states offer potential for creating synchronized defect arrays for microfluidic devices.