Cyclic thermodynamic processes and entropy production


We study the time evolution of a periodically driven quantummechanical system coupled to several reservoirs of free fermions at different temperatures and chemical potentials. This is a paradigm of a cyclic thermodynamic process. We introduce the notion of a Floquet Liouvillean as the generator of the dynamics of the coupled system on an extended Hilbert space. We show that the time-periodic state which the true state of the coupled system converges to after very many periods corresponds to a zero-energy resonance of the Floquet Liouvillean. We then show that the entropy production per cycle is (strictly) positive, a property that implies Carnot’s formulation of the second law of thermodynamics.

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@inproceedings{Salem2008CyclicTP, title={Cyclic thermodynamic processes and entropy production}, author={Walid K. Abou Salem and Juerg Froehlich}, year={2008} }