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DY: Fachverband Dynamik und Statistische Physik

DY 26: Posters - Statistical Physics, Stochastic Thermodynamics

DY 26.9: Poster

Dienstag, 21. März 2017, 18:15–21:00, P3

Work and Power in the Strong Coupling Regime — Martí Perarnau-Llobet^1,3, •Henrik Wilming², Arnau Riera³, Rodrigo Gallego², and Jens Eisert² — ¹Max-Planck-Institut fur Quantenoptik, Hans-Kopfermann-Str. 1, D-85748 Garching, Germany — ²Dahlem Center for Complex Quantum Systems, Freie Universität Berlin, 14195 Berlin, Germany — ³Institut de Ciencies Fotoniques (ICFO), The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain

We combine recent results in thermodynamics and the theory of equilibration in closed quantum systems to discuss work extraction of a quantum thermal machine strongly coupled to a heat bath. Giving the corrections to the weak-coupling limit, in particular we show that a finite coupling strength necessarily leads to irreversibility due to built-up of correlations. We then discuss the power of such strongly coupled thermal machines, showing that optimal power is reached for intermediate coupling strengths where the work per cycle is not optimal. Finally we exemplify all our results in the Caldeira-Leggett model. To analyze power in this model we also present new results regarding equilibration times in the Caldeira-Leggett model which might be of independent interest.