论文标题
内部摩擦的量子Carnot循环
Quantum Carnot cycle with inner friction
论文作者
论文摘要
研究单个驱动的自旋作为六冲程不可逆的量子carnot循环的工作物质。详细研究了与有限的绝热转化在周期效率和收获工作中相关的内部摩擦的作用。发现内部摩擦可显着降低工作输出和周期效率，从而使发动机无法为太快的绝热转换产生积极的工作。仅针对准静态转换才能达到理想的Carnot效率。效率滞后与由于内部摩擦而导致的总熵产生直接相关的效率延迟给出了循环效率与经典Carnot效率的偏差。在循环的松弛过程中释放的热量与熵产生和内部摩擦有关。还讨论了在液态状态核磁共振设置中的不变量子量子循环的量表不变量子工作物质的扩展。
A single driven spin is investigated as the working substance of a six-stroke irreversible quantum Carnot cycle. The role of inner friction associated with the finite-time adiabatic transformations on the cycle efficiency and the harvested work are investigated in detail. The inner friction is found to significantly reduce the work output and the cycle efficiency which can make the engine incapable to produce positive work for the too fast adiabatic transformations. The ideal Carnot efficiency is found to be reached only for the quasi-static transformations. A deviation of the cycle efficiency from the classical Carnot efficiency has been given by an efficiency lag which is directly related to the total entropy production due to the inner friction. The released heat in the relaxation processes of the cycle are associated with the entropy production and the inner friction. The extension of the results for a scale invariant quantum working substance and the possible experimental implementation of the irreversible quantum Carnot cycle in a liquid state nuclear magnetic resonance setup are also discussed.
