Generalized model and optimum performance of an irreversible quantum Brayton engine with spin systems.
Generalized model and optimum performance of an irreversible quantum Brayton engine with spin systems.
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DOI：
10.1103/physreve.73.016103
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发表时间：
2006-01
期刊：
影响因子：
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通讯作者：
Feng Wu;Lingen Chen;F. Sun;Chih Wu;Qing Li
中科院分区：
文献类型：
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作者：
Feng Wu;Lingen Chen;F. Sun;Chih Wu;Qing Li
本文的目的是建立一个以多个非相互作用自旋系统为工质、由两个不可逆绝热过程和两个等磁场过程组成的不可逆量子布雷顿发动机模型。总磁矩M的时间演化是通过求解海森堡图中开放系统的广义量子主方程来确定的。基于有限速率演化考虑两个不可逆绝热过程的时间。推导了具有自旋系统的不可逆量子布雷顿发动机的功率输出P与效率eta之间的关系。确定发动机的最佳运行区域（或标准）。讨论了这些重要参数对发动机性能（P 和 eta）的影响。本文获得的结果将有助于进一步理解和选择带有自旋系统的不可逆量子布雷顿发动机的最佳运行条件。
The purpose of this paper is to establish a model of an irreversible quantum Brayton engine using many noninteracting spin systems as the working substance and consisting of two irreversible adiabatic and two isomagnetic field processes. The time evolution of the total magnetic moment M is determined by solving the generalized quantum master equation of an open system in the Heisenberg picture. The time of two irreversible adiabatic processes is considered based on finite-rate evolution. The relationship between the power output P and the efficiency eta for the irreversible quantum Brayton engine with spin systems is derived. The optimally operating region (or criteria) for the engine is determined. The influences of these important parameters on the performances (P and eta) of the engine are discussed. The results obtained herein will be useful for the further understanding and the selection of the optimal operating conditions for an irreversible quantum Brayton engine with spin systems.