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Slipping and fluidisation in active crystalline rotors.

Abraham Mauleon-Amieva1,2, Tanniemola B Liverpool3, Ian Williams4

  • 1H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, UK.

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This summary is machine-generated.

Active colloids in hexagonal crystals exhibit stick-slip dynamics, transitioning between static and sliding states. This behavior offers insights into nanoscale friction and active matter design.

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Area of Science:

  • Physics
  • Materials Science
  • Soft Matter Physics

Background:

  • Commensurability governs nanoscale friction and crystal yielding in equilibrium systems.
  • Concepts of commensurability are emerging in the study of active matter.
  • Active colloids offer a model system to explore phenomena beyond equilibrium physics.

Purpose of the Study:

  • To develop an experimental platform and theoretical framework for active colloids in confined crystals.
  • To investigate the interplay between particle activity and crystal structure.
  • To understand novel dynamics such as self-shearing, flow inversion, and active stick-slip behavior.

Main Methods:

  • Experimental realization of active colloidal crystals using Quincke Rollers confined in a circular geometry.
  • Focus on perfect hexagonal crystallites of 61 particles.
  • Theoretical description using a discretised model of active hydrodynamics and an extended Frenkel-Kontorova (FK) model.

Main Results:

  • Observed competition between particle solidity and self-propulsion leading to self-shearing and flow inversion.
  • Discovered active stick-slip dynamics, characterized by transitions between commensurate static and incommensurate self-sliding states.
  • Identified activity-induced melting and localized defects during self-sliding.

Conclusions:

  • Active colloidal crystals exhibit rich dynamics, including stick-slip behavior driven by self-propulsion.
  • The findings provide a model system for understanding active solids and their potential applications.
  • This research offers design principles for nanoscale assembly and robotics using active matter.