Efficiency of a quantum Otto heat engine operating under a reservoir at effective negative temperatures
Quantum Physics
2019-06-26 v3
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.
Keywords
Cite
@article{arxiv.1811.02917,
title = {Efficiency of a quantum Otto heat engine operating under a reservoir at effective negative temperatures},
author = {Rogério J. de Assis and Taysa M. de Mendonça and Celso J. Villas-Boas and Alexandre M. de Souza and Roberto S. Sarthour and Ivan S. Oliveira and Norton G. de Almeida},
journal= {arXiv preprint arXiv:1811.02917},
year = {2019}
}
Comments
13 pages, 6 figures, Accepted in Physical Review Letters