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  • Title: Thermodynamic Geometry of Microscopic Heat Engines.
    Author: Brandner K, Saito K.
    Journal: Phys Rev Lett; 2020 Jan 31; 124(4):040602. PubMed ID: 32058746.
    Abstract:
    We develop a general framework to describe the thermodynamics of microscopic heat engines driven by arbitrary periodic temperature variations and modulations of a mechanical control parameter. Within the slow-driving regime, our approach leads to a universal trade-off relation between efficiency and power, which follows solely from geometric arguments and holds for any thermodynamically consistent microdynamics. Focusing on Lindblad dynamics, we derive a second bound showing that coherence as a genuine quantum effect inevitably reduces the performance of slow engine cycles regardless of the driving amplitudes. To show how our theory can be applied in practice, we work out a specific example, which lies within the range of current solid-state technologies.
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