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SUMMARY:Autonomous engines driven by active matter - Patrick Pietzonka\, D
 AMTP
DTSTART:20181016T120000Z
DTEND:20181016T130000Z
UID:TALK111313@talks.cam.ac.uk
CONTACT:Etienne Fodor
DESCRIPTION:We explore how active matter in a non-equilibrium steady state
  can autonomously deliver mechanical work against a constant mechanical fo
 rce or torque. For this purpose\, we consider systems that contain one or 
 several active components and a single passive component that is asymmetri
 c in its geometrical shape or its interactions. Generally\, one expects th
 at such an asymmetry leads to a persistent\, directed current in the passi
 ve component\, which can be used for the autonomous extraction of work. We
  validate this expectation for a minimal model featuring an active and a p
 assive particle on a one-dimensional lattice and identify thermodynamicall
 y consistent measures for the efficiency of the conversion of isotropic ac
 tivity to directed work. For systems with continuous degrees of freedom\, 
 work cannot be extracted using a one-dimensional geometry under quite gene
 ral conditions. We show which two-dimensional shapes of the passive partic
 le are best suited for the extraction of work. Approximating their effect 
 on the dynamics of the particles leads to analytical results for the power
  and efficiency. A mean field approach reveals that the interaction with t
 he passive particle can mediate cooperativity between otherwise non-intera
 cting active particles\, leading to an enhanced efficiency.
LOCATION:MR11\, CMS
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