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Active crystals and their stability.

Andreas M Menzel1, Takao Ohta2, Hartmut Löwen3

  • 1Institut für Theoretische Physik II: Weiche Materie, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, D-40225 Düsseldorf, Germany and Department of Physics, Kyoto University, Kyoto 606-8502, Japan.

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|October 30, 2014
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Summary
This summary is machine-generated.

Ordered migrating structures of self-propelled particles remain stable. However, hydrodynamic interactions from surrounding fluid films can disrupt this collective motion and crystal order.

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Area of Science:

  • Soft Matter Physics
  • Active Matter Systems
  • Non-equilibrium Statistical Mechanics

Background:

  • Active phase field crystal models explain ordered structures in self-propelled particle systems.
  • These models describe resting and traveling crystals, crucial for understanding collective behavior.

Purpose of the Study:

  • To investigate the linear stability of ordered migrating crystals formed by self-propelled particles.
  • To explore the impact of hydrodynamic interactions from a surrounding fluid film on crystal order and migration.

Main Methods:

  • Utilized a recently introduced active phase field crystal model.
  • Analyzed the stability of migrating crystalline structures under varying active drive.
  • Incorporated a thin fluid film to study hydrodynamic effects on particle dynamics.

Main Results:

  • Ordered migrating structures, characterized by single-crystalline texture and global motion, are linearly stable.
  • This stability ensures preservation of order and collective motion on large length scales.
  • Hydrodynamic interactions from the fluid film were found to destabilize the ordered migrating structures.

Conclusions:

  • Active phase field crystal models provide a framework for understanding stable collective migration.
  • The inherent stability of migrating crystals is demonstrated, preserving order during movement.
  • Fluid dynamics introduce a critical factor that can disrupt collective order in active matter systems.