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Crystallization and flow in active patch systems.

Jaffar Hasnain1, Georg Menzl, Swetlana Jungblut

  • 1Department of Chemistry, University of California, Berkeley, California 94720, USA. jhasnain@berkeley.edu.

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Applying light patterns to Janus particles creates active zones, influencing their movement like a temperature gradient. Asymmetric patterns reveal unique behaviors specific to partial active motion.

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Area of Science:

  • Physics
  • Soft Matter Physics
  • Active Matter

Background:

  • Janus particles can be controllably activated into swimmers using laser light.
  • Understanding the collective behavior of active particles is crucial in soft matter physics.

Purpose of the Study:

  • To investigate the effects of spatially patterned light on the collective dynamics of Janus particles.
  • To analyze the structure and dynamics of stationary states formed by particles in activity-inducing zones.

Main Methods:

  • Simulating a system of interacting Brownian diffusers.
  • Implementing spatially inhomogeneous light patterns to create active patches.
  • Analyzing the emergent stationary states and particle dynamics within these patches.

Main Results:

  • Spatially inhomogeneous activity shows similarities to a temperature gradient in some aspects.
  • Asymmetric active patches lead to unique stationary states not explained by the temperature gradient analogy.
  • The system exhibits behaviors specific to partial active motion within defined zones.

Conclusions:

  • Light patterns can effectively control the collective behavior of Janus particles.
  • The analogy to temperature gradients is limited, particularly for asymmetric activity distributions.
  • Partial active motion in patterned environments creates novel stationary states and dynamics.