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Quantum Thermodynamics
Efficiency of a quantum Otto heat engine operating under a reservoir at effective negative temperatures
arXiv
Authors: Rogério J. de Assis, Taysa M. de Mendonça, Celso J. Villas-Boas, Alexandre M. de Souza, Roberto S. Sarthour, Ivan S. Oliveira, Norton G. de Almeida
Year
2018
Paper ID
23516
Status
Preprint
Abstract Read
~2 min
Abstract Words
83
Citations
N/A
Abstract
Abstract We perform an experiment in which a quantum heat engine works under two reservoirs, one at a positive spin temperature and the other at an effective negative spin temperature i.e., when the spin system presents population inversion. We show that the efficiency of this engine can be greater than that when both reservoirs are at positive temperatures. We also demonstrate the counter-intuitive result that the Otto efficiency can be beaten only when the quantum engine is operating in the finite-time mode.
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- Abstract We perform an experiment in which a quantum heat engine works under two reservoirs, one at a positive spin temperature and the other at an effective negative spin...
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