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CATEGORIES:DAMTP Statistical Physics and Soft Matter Seminar
SUMMARY:Autonomous engines driven by active matter - Patri
 ck Pietzonka\, DAMTP
DTSTART;TZID=Europe/London:20181016T130000
DTEND;TZID=Europe/London:20181016T140000
UID:TALK111313AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/111313
DESCRIPTION:We explore how active matter in a non-equilibrium 
 steady state can autonomously deliver mechanical w
 ork against a constant mechanical force or torque.
  For this purpose\, we consider systems that conta
 in one or several active components and a single p
 assive component that is asymmetric in its geometr
 ical shape or its interactions. Generally\, one ex
 pects that such an asymmetry leads to a persistent
 \, directed current in the passive component\, whi
 ch can be used for the autonomous extraction of wo
 rk. We validate this expectation for a minimal mod
 el featuring an active and a passive particle on a
  one-dimensional lattice and identify thermodynami
 cally consistent measures for the efficiency of th
 e conversion of isotropic activity to directed wor
 k. For systems with continuous degrees of freedom\
 , work cannot be extracted using a one-dimensional
  geometry under quite general conditions. We show 
 which two-dimensional shapes of the passive partic
 le are best suited for the extraction of work. App
 roximating their effect on the dynamics of the par
 ticles leads to analytical results for the power a
 nd efficiency. A mean field approach reveals that 
 the interaction with the passive particle can medi
 ate cooperativity between otherwise non-interactin
 g active particles\, leading to an enhanced effici
 ency.
LOCATION:MR11\, CMS
CONTACT:Etienne Fodor
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