Quantum heat engine cycle working with a strongly correlated electron system
Quantum heat engine cycle working with a strongly correlated electron system
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DOI：
10.1007/s11433-012-4678-9
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发表时间：
2012-03
影响因子：
6.4
通讯作者：
Wang Hai-long;P. Hui;Wang Rong-ming
中科院分区：
文献类型：
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作者：
Wang Hai-long;P. Hui;Wang Rong-ming
建立了一种新的量子热机（QHE）循环模型，其中工质由相互作用的电子系统组成。我们的目的之一是通过这个模型来检验热力学第二定律的有效性，这个模型比自旋1/2反铁磁海森堡模型更一般，因为当在位库仑相互作用U足够强时，它会恢复自旋模型。根据量子力学和热力学第一定律，我们发现在循环过程中没有违反热力学第二定律。我们进一步研究了循环的性能特点，详细调查的效率和无因次功率输出的最佳关系。我们发现，我们的发动机的效率可以表示为η= 1 −t22/t21在大U限制，这是有效的，即使是一个四个网站QHE。
A new model of a quantum heat engine (QHE) cycle is established, in which the working substance consists of an interacting electrons system. One of our purposes is to test the validity of the second law of thermodynamics by this model, which is more general than the spin-1/2 antiferromagnetic Heisenberg model since it would recover the spin model when the on-site Coulomb interaction U is strong enough. On the basis of quantum mechanics and the first law of thermodynamics, we show no violation of the second law of thermodynamics during the cycle. We further study the performance characteristics of the cycle by investigating in detail the optimal relations of efficiency and dimensionless power output. We find that the efficiency of our engine can be expressed asη= 1 −t22/t21in the large-U limit, which is valid even for a four sites QHE.