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Alignment destabilizes crystal order in active systems.

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|January 15, 2022
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Summary
This summary is machine-generated.

This study explores active crystals with linked swimmers, revealing distinct stationary and moving phases. Different alignment interactions significantly alter the order and phase behavior in these dynamic systems.

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Area of Science:

  • Soft Matter Physics
  • Condensed Matter Theory
  • Active Matter Physics

Background:

  • Active crystals, composed of self-propelled units, exhibit unique collective behaviors distinct from equilibrium systems.
  • Understanding the interplay between particle interactions and emergent order is crucial for active matter research.

Purpose of the Study:

  • To investigate the phase behavior and ordering properties of two-dimensional active crystals with permanent links.
  • To analyze the influence of two distinct alignment interactions (Vicsek-like and elasticity-based) on crystal order.
  • To generalize findings to higher dimensional systems.

Main Methods:

  • Combined numerical simulations and analytical techniques.
  • Studied systems with permanently linked swimmers.
  • Investigated two types of alignment interactions: Vicsek-like and elasticity-based.

Main Results:

  • Identified a stationary phase with quasi-long-range translational order.
  • Characterized a moving phase with quasi-long-range active force director and velocity order.
  • Demonstrated that alignment interactions critically affect translational order in the moving phase: Vicsek-like alignment leads to short-range translational and quasi-long-range bond-orientational order (moving hexatic phase), while elasticity-based alignment results in quasi-long-range translational order parallel to motion and long-range bond-orientational order.

Conclusions:

  • Active crystals exhibit rich phase behavior dependent on alignment interactions.
  • The study provides a framework for understanding order in active crystalline systems.
  • Findings are generalizable to higher dimensions, offering insights into broader active matter phenomena.