Regensburg 2019 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 30: Statistical Physics far from Thermal Equilibrium

DY 30.4: Talk

Wednesday, April 3, 2019, 11:00–11:15, H6

The Quantum Otto Engine in Finite Time: Dynamics, Thermodynamics and Coherence — Michael Wiedmann, •Jürgen T. Stockburger, and Joachim Ankerhold — Ulm University, Institute for Complex Quantum Systems

We perform complete, exact dynamical simulations of the quantum Otto engine in terms of the full, interacting dynamics of the work medium and its two thermal reservoirs. In this context, the Otto cycle is defined by externally modulating the oscillation frequency of the work medium (“piston”) and the coupling constants to the reservoirs (“valves”). We find that the work expended in operating the “valves” is far from negligible in this engine. Moreover, the system dynamics in cyclic operation displays non-thermal effects (squeezing, coherence), which should be taken into account in the finite-time thermodynamics of the Otto cycle.