Dresden 2017 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 8: Statistical Physics far from Thermal Equilibrium
DY 8.2: Vortrag
Montag, 20. März 2017, 15:15–15:30, ZEU 118
Nonequilibrium thermodynamics in the strong coupling and non-Markovian regime based on a reaction coordinate mapping — •Philipp Strasberg1, Gernot Schaller1, Neill Lambert2, and Tobias Brandes1 — 1Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstr. 36, D-10623 Berlin, Germany — 2CEMS, RIKEN, Saitama, 351-0198, Japan
We propose a method to study the thermodynamic behaviour of small systems beyond the weak coupling and Markovian approximation, which is different in spirit from conventional approaches. The idea is to redefine the system and environment such that the effective, redefined system is again coupled weakly to Markovian residual baths and thus, allows to derive a consistent thermodynamic framework for this new system-environment partition. To achieve this goal we make use of the reaction coordinate mapping, which is a general method in the sense that it can be applied to an arbitrary (quantum or classical and even time-dependent) system coupled linearly to an arbitrary number of harmonic oscillator reservoirs. We demonstrate the power of this concept by showing that non-Markovian effects can significantly enhance the steady state efficiency of a three-level-maser heat engine, even in the regime of weak system-bath coupling.
Reference: New. J. Phys. 18, 073007