论文标题

基于库仑耦合系统的现实非本地制冷引擎

Realistic non-local refrigeration engine based on Coulomb coupled systems

论文作者

Barman, Anamika, Halder, Surojit, Varshney, Shailendra K., Dutta, Gourab, Singha, Aniket

论文摘要

使用库仑耦合系统,我们证明了一种低温的非本地制冷发动机,该发动机避免了对最近提出的非局部冰箱要求的能量解决系统之间变化的系统之间的变化。我们证明,与库仑偶联相关的相邻隧道耦合量子点的基态之间有意引入能量差,足以从远程目标储层中提取热量。我们使用量子掌握方程(QME)方法调查了性能和操作制度,我们指出了提出的制冷引擎的一些关键方面。特别是,我们证明了拟议的设置的最大冷却能力仅限于最佳设计的$ 70 \%$。进一步进行,我们指出,要达到目标储层温度,与当前路径的平均温度相比,施加的电压必须大于给定阈值电压$ v_ {th} $,这会随着目标储层温度的降低而增加。此外,我们证明了最大冷却能力以及性能系数随着较低的目标储层温度而恶化。提议的制冷引擎的新颖性是制造简单性以及下降冷却能力的整合。本文提出的想法可能为实现有效的非本地低温制冷系统的实现铺平了道路。

Employing Coulomb-coupled systems, we demonstrate a cryogenic non-local refrigeration engine, that circumvents the need for a change in the energy resolved system-to-reservoir coupling, demanded by the recently proposed non-local refrigerators. We demonstrate that an intentionally introduced energy difference between the ground states of adjacent tunnel coupled quantum dots, associated with Coulomb coupling, is sufficient to extract heat from a remote target reservoir. Investigating the performance and operating regime using quantum-master-equation (QME) approach, we point out to some crucial aspects of the proposed refrigeration engine. In particular, we demonstrate that the maximum cooling power for the proposed set-up is limited to about $70\%$ of the optimal design. Proceeding further, we point out that to achieve a target reservoir temperature, lower compared to the average temperature of the current path, the applied voltage must be greater than a given threshold voltage $V_{TH}$, that increases with decrease in the target reservoir temperature. In addition, we demonstrate that the maximum cooling power, as well as the coefficient of performance deteriorates as one approaches a lower target reservoir temperature. The novelty of the proposed refrigeration engine is the integration of fabrication simplicity along with descent cooling power. The idea proposed in this paper may pave the way towards the realization of efficient non-local cryogenic refrigeration systems.

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