Nanoelectronic primary thermometry below 4 mK.
Nanoelectronic primary thermometry below 4 mK.
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DOI：
10.1038/ncomms10455
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发表时间：
2016-01-27
影响因子：
16.6
通讯作者：
Sarsby M
中科院分区：
文献类型：
--
作者：
Bradley DI;George RE;Gunnarsson D;Haley RP;Heikkinen H;Pashkin YA;Penttilä J;Prance JR;Prunnila M;Roschier L;Sarsby M
将纳米电子结构冷却到毫开尔文温度在保持器件中的电子与外部冷浴之间的热接触方面提出了极端的挑战。通常发现，当纳米级器件被冷却到10 mK时，电子明显过热。在这里，我们报告冷却的电子在纳米电子库仑阻塞温度计低于4 mK。低工作温度归因于优化设计，该设计结合了具有高电子-声子耦合的散热片和片上电子滤波器，并结合了低噪声电子测量。通过将库仑阻塞温度计浸入稀释制冷机的3 He/4 He制冷剂中，我们测量到最低电子温度为3.7mK，并有接近3 mK的饱和电子温度的趋势。这项工作演示了如何将纳米电子样品进一步冷却到低毫开尔文范围内。 当冷却到毫开尔文尺度时，纳米电子结构可以从其环境中热分离，限制了纳米级电子温度测量。在这里，作者展示了优化设计的库仑阻塞温度计设备的强大冷却到毫开尔文尺度。
Cooling nanoelectronic structures to millikelvin temperatures presents extreme challenges in maintaining thermal contact between the electrons in the device and an external cold bath. It is typically found that when nanoscale devices are cooled to ∼10 mK the electrons are significantly overheated. Here we report the cooling of electrons in nanoelectronic Coulomb blockade thermometers below 4 mK. The low operating temperature is attributed to an optimized design that incorporates cooling fins with a high electron–phonon coupling and on-chip electronic filters, combined with low-noise electronic measurements. By immersing a Coulomb blockade thermometer in the 3He/4He refrigerant of a dilution refrigerator, we measure a lowest electron temperature of 3.7 mK and a trend to a saturated electron temperature approaching 3 mK. This work demonstrates how nanoelectronic samples can be cooled further into the low-millikelvin range. When cooled to the millikelvin scale, nanoelectronic structures can become thermally detached from their environment, limiting nanoscale electronic thermometry. Here, the authors demonstrate the robust cooling of optimally-designed Coulomb blockade thermometer devices down to the millikelvin scale.