Berlin 2018 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 52: Active Matter III (joint session DY/CPP/BP)
DY 52.4: Talk
Wednesday, March 14, 2018, 16:15–16:30, BH-N 243
Cans and cannots of heat engines with nonequilibrium baths — •stefano steffenoni1, viktor holubec2, gianmaria falasco3, and klaus kroy2 — 1Max Planck for the Mathematics in the Science, leipzig — 2Institute for Theoretic Physics, Leipzig — 3University of Luxembourg, Luxembourg
We investigate a heat engine based on a Brownian colloid, confined in a parabolic potential and coupled to an active particles bath. The energetics of the cycle is governed by the variance of the colloid distribution. With a suitable definition of a time-dependent effective temperature, it obeys the same dynamical equation as a passive colloid coupled to a conventional thermal bath. Performance of the active heat engine including maximum efficiency, efficiency at maximum power and maximum efficiency at a fixed power can thus all be understood from ordinary thermodynamics, using the appropriate effective temperature. On this basis, we provide a thorough analysis of recent experiments (Krishnamurty et al. Nat. Phys. 2016) that lead to the spectacular claim that thermodynamic cycles coupled to active baths can surpass the ultimate efficiency of an equilibrium Stirling cycle.