Thermodynamic Bounds on Efficiency for Systems with Broken Time-reversal Symmetry

Details Thermodynamic Bounds on Efficiency for Systems with Broken Time-reversal Symmetry Thermodynamic Bounds on Efficiency for Systems with Broken Time-reversal Symmetry

2011-02-23

arxiv.org/abs/1102.4735v2

Phys. Rev. Lett. 106, 230602 (2011)

Physics

Condensed Matter

Statistical Mechanics

Final version, 4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.106.230602

We show that for systems with broken time-reversal symmetry the maximum efficiency and the efficiency at maximum power are both determined by two parameters: a "figure of merit" and an asymmetry parameter. In contrast to the time-symmetric case, the figure of merit is bounded from above; nevertheless the Carnot efficiency can be reached at lower and lower values of the figure of merit and far from the so-called strong coupling condition as the asymmetry parameter increases. Moreover, the Curzon-Ahlborn limit for efficiency at maximum power can be overcome within linear response. Finally, always within linear response, it is allowed to have simultaneously Carnot efficiency and non-zero power.

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