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DY: Fachverband Dynamik und Statistische Physik

DY 29: Poster II

DY 29.2: Poster

Thursday, February 28, 2008, 16:00–18:00, Poster C

Efficiency at maximum work for quantum thermodynamic machines — •Thomas Jahnke and Günter Mahler — Universität Stuttgart, 1. Institut für Theoretische Physik, Pfaffenwaldring 57, 70550 Stuttgart

Quantum thermodynamic processes can be described by means of a control model [1]: Introducing a statistical and a mechanical control parameter allows to define these processes as curves on the 2-dimensional control plane. Any process type known from macroscopic thermodynamics can thus be reformulated. Here we investigate the efficiency at maximum work for the Otto- and the Escher-Wyss-cycle acting between two baths of given temperatures. These efficiencies are found to lie between the Curzon-Ahlborn- and the Carnot-efficiency for all investigated spectra. We also discuss the limit, where the Curzon-Ahlborn-efficiency is reached.

[1] J. Birjukov, T. Jahnke and G. Mahler: Eur. Phys. J. B (submitted 2007)