Efficiency of a Quantum Otto Heat Engine Operating under a Reservoir at Effective Negative Temperatures
Efficiency of a Quantum Otto Heat Engine Operating under a Reservoir at Effective Negative Temperatures
复制标题
DOI：
10.1103/physrevlett.122.240602
复制
发表时间：
2019-06-19
影响因子：
8.6
通讯作者：
de Almeida, Norton G.
中科院分区：
文献类型：
--
作者：
de Assis, Rogerio J.;de Mendonca, Taysa M.;de Almeida, Norton G.
我们进行了一个实验，其中量子热机在两个水库下工作，一个在正自旋温度下，另一个在有效负自旋温度下，即，当自旋系统呈现粒子数反转时。我们表明，这种发动机的效率可以大于当两个水库都在正温度。我们还证明了反直觉的结果，即只有当量子引擎在有限时间模式下运行时，奥托效率才能被击败。
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.