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(1) Presentation(s)

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Mar. 04/12/2018 10:30 Petite Ourse, Bâtiment 13, Etage 1

Séminaire
FODOR Etienne (Dampt, Cambridge University)
Extracting work and optimizing dissipation in active matter

Sommaire:

Active systems are made of interacting particles which extract energy from their environment to perform a directed motion. For instance, bacteria consume some nutrients to exert forces with their flagella, which allows them to move persistently by alternating running and tumbling periods. In contrast with equilibrium, active systems constantly dissipate energy: this offers the opportunity to build some autonomous engines extracting work at constant temperature. I will discuss how to design efficient active engines which operate by either exploiting the current of some asymmetric obstacles or driving some confining walls with cyclic protocols. Moreover, active particles can undergo spontaneous transitions driven by collective effects. I will explore the role of dissipation in the emergence of such collective states, to shed light on transitions between a phase separation with purely repulsive interactions and a collective motion despite the lack of aligning interactions.


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