Vibrated polar disks: Spontaneous motion, binary collisions, and collective dynamics
Soft Matter, ISSN: 1744-683X, Vol: 8, Issue: 20, Page: 5629-5639
2012
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Article Description
We study the spontaneous motion, binary collisions, and collective dynamics of "polar disks", i.e. specially designed particles which, when vibrated between two horizontal plates, move coherently along a direction strongly correlated to their intrinsic polarity. The motion of our particles, although nominally three-dimensional and complicated, is well accounted for by a two-dimensional persistent random walk. Their binary collisions are spatiotemporally extended events during which multiple actual collisions happen, yielding a weak average effective alignment. We show that this well-controlled, "dry active matter" system can display collective motion with orientationally-ordered regions of the order of the system size. We provide evidence of strong number density fluctuations in the most ordered regimes observed. These results are discussed in the light of the limitations of our system, notably those due to the inevitable presence of walls. © 2012 The Royal Society of Chemistry.
Bibliographic Details
Royal Society of Chemistry (RSC)
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