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

被引：108

作者：

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
]}

机构：

[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

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 122卷 / 24期

基金：

巴西圣保罗研究基金会;

关键词：

41;

D O I：

10.1103/PhysRevLett.122.240602

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：5

共 39 条

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