Efficiency of a quantum Otto heat engine operating under a reservoir at effective negative temperatures

Assis, Rogério Jorge de; Mendonça, Taysa Mendes de; Villas-Bôas,  Celso Jorge; Souza, Alexandre Martins de; Sarthour Junior, Roberto Silva; Oliveira Júnior, Ivan dos Santos; Almeida, Norton Gomes de

Efficiency of a quantum Otto heat engine operating under a reservoir at effective negative temperatures

Data

2019

Autores

Assis, Rogério Jorge de

Mendonça, Taysa Mendes de

Villas-Bôas, Celso Jorge

Souza, Alexandre Martins de

Sarthour Junior, Roberto Silva

Oliveira Júnior, Ivan dos Santos

Almeida, Norton Gomes de

Resumo

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.

Citação

ASSIS, Rogério J. de et al. Efficiency of a quantum Otto heat engine operating under a reservoir at effective negative temperatures. Physical Review Letters, College Park, v. 122, e240602, 2019. DOI: 10.1103/PhysRevLett.122.240602. Disponível em: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.122.240602. Acesso em: 18 mar. 2024.