Emergent cometlike swarming of optically driven thermally active colloids

Cohen, J. A.; Golestanian, Ramin

doi:10.1103/PhysRevLett.112.068302

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Emergent cometlike swarming of optically driven thermally active colloids

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Golestanian, Ramin
Department of Living Matter Physics, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Cohen, J. A., & Golestanian, R. (2014). Emergent cometlike swarming of optically driven thermally active colloids. Physical Review Letters, 112(6): 068302. doi:10.1103/PhysRevLett.112.068302.

Cite as: https://hdl.handle.net/21.11116/0000-0001-76F1-A

Abstract

We propose a simple system of optically driven colloids that convert light into heat and move in response to self-generated and collectively generated thermal gradients. We show that the system exhibits self-organization into a moving cometlike swarm and characterize the structure and response of the swarm to a light-intensity-dependent external tuning parameter. We observe many interesting features in this nonequilibrium system including circulation and evaporation, intensity-dependent shape, density and temperature fluctuations, and ejection of hot colloids from the swarm tip. © 2014 American Physical Society.