通过调节与引线的耦合可调热泵
Tunable heat pump by modulating the coupling to the leads
摘要：
我们遵循非平衡格林函数的形式主义，研究随时间变化的热输运的线性链系统组成的两个半无限的铅连接在一起的耦合，是谐波调制的时间。这种调节是由一种可以吸收和发射能量的外部介质驱动的。我们确定的能量电流流出的引线正是通过数值求解戴森方程的轮廓有序的格林函数。调制耦合的幅度与每个电极导线内的粒子间耦合的量级相同。当引线具有相同的温度时，我们的数值计算结果表明，调制引线之间的耦合可以引导能量同时流入引线或同时流出引线，这取决于驱动频率和温度的值。存在驱动频率和温度值的特殊组合，其中即使长时间也没有净能量流入或流出引线。当其中一根导线比另一根导线更热时，净能量从较热的导线流出。然而，对于较冷的引线，能量电流流动的方向取决于驱动频率和温度的值。此外，我们发现瞬态效应变得更明显的驱动频率的值更高。
英文摘要：
We follow the nonequilibrium Green's function formalism to study time-dependent thermal transport in a linear chain system consisting of two semi-infinite leads connected together by a coupling that is harmonically modulated in time. The modulation is driven by an external agent that can absorb and emit energy. We determine the energy current flowing out of the leads exactly by solving numerically the Dyson equation for the contour-ordered Green's function. The amplitude of the modulated coupling is of the same order as the interparticle coupling within each lead. When the leads have the same temperature, our numerical results show that modulating the coupling between the leads may direct energy to either flow into the leads simultaneously or flow out of the leads simultaneously, depending on the values of the driving frequency and temperature. A special combination of values of the driving frequency and temperature exists wherein no net energy flows into or out of the leads, even for long times. When one of the leads is warmer than the other, net energy flows out of the warmer lead. For the cooler lead, however, the direction of the energy current flow depends on the values of the driving frequency and temperature. In addition, we find transient effects to become more pronounced for higher values of the driving frequency.
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