Journal
EPL
Volume 110, Issue 6, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1209/0295-5075/110/67003
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Funding
- DFG [SCHA 1646/3-1, SFB 910, GRK 1558]
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We investigate the thermodynamics of simple (non-interacting) transport models beyond the scope of weak coupling. For a single fermionic or bosonic level -tunnel-coupled to two reservoirs-exact expressions for the stationary matter and energy current are derived from the solutions of the Heisenberg equations of motion. The positivity of the steady-state entropy production rate is demonstrated explicitly. Finally, for a configuration in which particles are pumped upwards in chemical potential by a downward temperature gradient, we demonstrate that the thermodynamic efficiency of this process decreases when the coupling strength between system and reservoirs is increased, as a direct consequence of the loss of a tight coupling between energy and matter currents. Copyright (C) EPLA, 2015.
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