Sub-50-mK Electronic Cooling with Large-Area Superconducting Tunnel Junctions
Sub-50-mK Electronic Cooling with Large-Area Superconducting Tunnel Junctions
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DOI：
10.1103/physrevapplied.2.054001
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发表时间：
2014-11-04
影响因子：
4.6
通讯作者：
Pekola, J. P.
中科院分区：
文献类型：
--
作者：
Nguyen, H. Q.;Meschke, M.;Pekola, J. P.
在超导隧道结的电子冷却中，冷却功率通过与声子的相互作用和来自过热引线的热流来平衡。我们研究铝基冷却器，配备了一个悬浮正常的金属和一个有效的准粒子排水。在中等温度下，悬浮的正常金属的声子浴被冷却。通过调整结的透明度，我们控制注入电流，从而控制超导导线在最佳冷却点的温度。最好的设备显示出从150 mK下降到约30 mK的显著冷却，在40 pW的功率下温度为5倍。我们讨论了我们的设备中的热传输和冷却饱和的原因在低温端。
In electronic cooling with superconducting tunnel junctions, the cooling power is counterbalanced by the interaction with phonons and by the heat flow from the overheated leads. We study aluminum-based coolers that are equipped with a suspended normal metal and an efficient quasiparticle drain. At intermediate temperatures, the phonon bath of the suspended normal metal is cooled. By adjusting the junction transparency, we control the injection current and, thus, the temperature of the superconducting lead at the optimum cooling point. The best device shows remarkable cooling from 150 mK down to about 30 mK, a factor of 5 in temperature at a power of 40 pW. We discuss heat transport in our device and the reasons for cooling saturation at the low-temperature end.