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arXiv 2009.14166cond-mat.supr-con
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级联超导结制冷机:优化和性能极限

Cascaded superconducting junction refrigerators: optimization and performance limits

A. Kemppinen, A. Ronzani, E. Mykkänen, J. Hätinen, J. S. Lehtinen, M. Prunnila

摘要:

我们展示了高度透明的硅-钒和硅-铝隧道结,具有相对较低的子间隙漏电流,并讨论了透明度和泄漏之间通常遇到的权衡如何影响其制冷性能。从理论上研究了具有两个或多个制冷级的级联超导隧道结制冷机。特别是,我们开发了一个近似的方法,考虑到自热效应,但仍然允许我们优化级联一个单级的时间。我们设计了一个由节能制冷级组成的级联,从1 K以上到100 mK以下的量子器件是一个现实的实验目标。

英文摘要:

We demonstrate highly transparent silicon-vanadium and silicon-aluminum tunnel junctions with relatively low sub-gap leakage current and discuss how a trade-off typically encountered between transparency and leakage affects their refrigeration performance. We theoretically investigate cascaded superconducting tunnel junction refrigerators with two or more refrigeration stages. In particular, we develop an approximate method that takes into account self-heating effects but still allows us to optimize the cascade a single stage at a time. We design a cascade consisting of energy-efficient refrigeration stages, which makes cooling of, e.g., quantum devices from above 1 K to below 100 mK a realistic experimental target.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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