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arXiv 2109.09677cond-mat.mes-hall
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射频库仑阻塞测温法

Radio frequency Coulomb blockade thermometry

Florian Blanchet, Yu-Cheng Chang, Bayan Karimi, Joonas T. Peltonen, Jukka P. Pekola

摘要:

我们提出了一个方案,并演示了在微波传输设置的库仑阻塞温度计(CBT)的测量。传感器嵌入在$LCR$谐振器中,其中$R$由CBT的结阵列的电导确定。透射测量产生的信号与CBT的电导成正比,从而实现温度计的免校准操作。这是通过在通常的直流设置中同时测量相同的传感器来验证的。射频测量的重要优势在于其速度:现在可以在大约100 ms的时间内测量CBT电导的整个偏置依赖性,这比标准直流测量快上千倍。在浴温度$T=200\,$ mK下,该第一rf初级测量所获得的噪声等效温度约为1 mK/ $\sqrt{\rm Hz}$。

英文摘要:

We present a scheme and demonstrate measurements of a Coulomb blockade thermometer (CBT) in a microwave transmission setup. The sensor is embedded in an $LCR$ resonator, where $R$ is determined by the conductance of the junction array of the CBT. A transmission measurement yields a signal that is directly proportional to the conductance of the CBT, thus enabling the calibration-free operation of the thermometer. This is verified by measuring an identical sensor simultaneously in the usual dc setup. The important advantage of the rf measurement is its speed: the whole bias dependence of the CBT conductance can now be measured in a time of about 100\,ms, which is thousand times faster than in a standard dc measurement. The achieved noise equivalent temperature of this first rf primary measurement is about 1 mK/$\sqrt{\rm Hz}$ at the bath temperature $T=200\,$mK.

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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