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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Efficiency of a Quantum Otto Heat Engine Operating under a Reservoir at Effective Negative Temperatures

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de Assis, Rogerio J. [1] ; de Mendonca, Taysa M. [2] ; Villas-Boas, Celso J. [2] ; de Souza, Alexandre M. [3] ; Sarthour, Roberto S. [3] ; Oliveira, Ivan S. [3] ; de Almeida, Norton G. [1]
Total Authors: 7
[1] Univ Fed Goias, Inst Fis, BR-74001970 Goiania, Go - Brazil
[2] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos, SP - Brazil
[3] Ctr Brasileiro Pesquisas Fis, Rua Dr Xavier Sigaud 150, BR-22290180 Rio De Janeiro, RJ - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Physical Review Letters; v. 122, n. 24 JUN 19 2019.
Web of Science Citations: 3

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 counterintuitive result that the Otto efficiency can be beaten only when the quantum engine is operating in the finite-time mode. (AU)

FAPESP's process: 13/04162-5 - Development of quantum sensors based on ultracold atoms
Grantee:Philippe Wilhelm Courteille
Support type: Research Projects - Thematic Grants