Efficient electronic cooling by niobium-based superconducting tunnel junctions

被引：0

作者：

Hatinen, J. ^{[1
]}

Ronzani, A. ^{[1
]}

Loreto, R. P. ^{[1
]}

Mykkanen, E. ^{[1
]}

Kemppinen, A. ^{[1
]}

Viisanen, K. ^{[1
]}

Rantanen, T. ^{[1
]}

Geisor, J. ^{[1
]}

Lehtinen, J. S. ^{[1
]}

Ribeiro, M. ^{[1
]}

Kaikkonen, J. -P. ^{[1
]}

Prakash, O. ^{[1
]}

Vesterinen, V. ^{[1
]}

Forbom, C. ^{[1
]}

Mannila, E. T. ^{[1
]}

Kervinen, M. ^{[1
]}

Govenius, J. ^{[1
]}

Prunnila, M. ^{[1
]}

机构：

[1] VTT Tech Res Ctr Finland, Oulu, Finland

来源：

PHYSICAL REVIEW APPLIED | 2024年 / 22卷 / 06期

基金：

芬兰科学院;

关键词：

REFRIGERATION; TEMPERATURE;

D O I：

10.1103/PhysRevApplied.22.064048

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Replacing the bulky cryoliquid-based cooling stages of cryoenabled instruments by chip-scale refrigeration is envisioned to disruptively reduce the system size similar to microprocessors did for computers. Electronic refrigerators based on superconducting tunnel junctions have been anticipated to provide a solution, but reaching the necessary above the 1-K operation temperature range has remained a goal out of reach for several decades. We show efficient electronic refrigeration by Al-AlOx-Nb superconducting tunnel junctions starting from bath temperatures above 2 K. The junctions can deliver electronic cooling power up to approximately mW/mm2, which enables us to demonstrate tunnel-current-driven electron temperature reduction from 2.4 K to below 1.6 K (34% relative cooling) against the phonon bath. Our work shows that the key material of integrated superconducting circuits-niobium-enables powerful cryogenic refrigerator technology. This result is a prerequisite for practical cryogenic chip-scale refrigerators and, at the same time, it introduces a new electrothermal tool for quantum heat-transport experiments.

引用

页数：7

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