Cascaded superconducting junction refrigerators: Optimization and performance limits

Antti Kemppinen; Alberto Ronzani; Emma Mykkänen; Joel Hätinen; Janne S. Lehtinen; Mika Prunnila

doi:10.1063/5.0060652

Cascaded superconducting junction refrigerators: Optimization and performance limits

Antti Kemppinen^*, Alberto Ronzani, Emma Mykkänen, Joel Hätinen, Janne S. Lehtinen, Mika Prunnila

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

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Abstract

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.

Original language	English
Article number	052603
Number of pages	5
Journal	Applied Physics Letters
Volume	119
Issue number	5
DOIs	https://doi.org/10.1063/5.0060652
Publication status	Published - 2 Aug 2021
MoE publication type	A1 Journal article-refereed

Funding

This research was funded by the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No. 766853 EFINED, the Academy of Finland through projects ETHEC, UQS, and QuMOS (Nos. 322580, 310909, and 288907), and the Centre of Excellence program Nos. 336817 and 312294.

Keywords

cond-mat.supr-con

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1063/5.0060652

2009.14166v1Final published version, 2.29 MB

https://arxiv.org/abs/2009.14166

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abstract = "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.",

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AU - Lehtinen, Janne S.

AU - Prunnila, Mika

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Cascaded superconducting junction refrigerators: Optimization and performance limits

Abstract

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Keywords

UN SDGs

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