Final published version
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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Microkelvin electronics on a pulse-tube cryostat with a gate Coulomb-blockade thermometer
AU - Samani, Mohammad
AU - Scheller, Christian
AU - Sedeh, Omid Sharifi
AU - Zumbühl, Dominik
AU - Yurttagül, Nikolai
AU - Grigoras, Kestutis
AU - Gunnarsson, David
AU - Prunnila, Mika
AU - Jones, Alexander
AU - Prance, Jonathan
AU - Haley, Richard
PY - 2022/9/19
Y1 - 2022/9/19
N2 - Temperatures below 1 mK on-chip hold great potential for quantum physics but present a great challenge due to the lack of suitable thermometry and the detrimental pulse-tube vibrations of cryogen-free refrigerators. Here, we solve the pulse-tube problem using a rigidly wired metallic sample holder, which provides a microkelvin environment with low heat leaks despite the vibrations. Further, we demonstrate an improved type of temperature sensor, the gate Coulomb blockade thermometer (gCBT), employing a gate metallization covering the entire device. This immunizes against nanofabrication imperfections and uncontrollable offset charges, and extends the range to lower temperatures compared to a junction CBT with the same island capacitance, here down to ≈160 μK for a 10% accuracy. Using on- and off-chip cooling, we demonstrate electronic temperatures as low as 224 ± 7 μK, remaining below 300 μK for 27 hours, thus providing time for experiments. Finally, we give an outlook for cooling below 50 μK for a future generation of microkelvin transport experiments.
AB - Temperatures below 1 mK on-chip hold great potential for quantum physics but present a great challenge due to the lack of suitable thermometry and the detrimental pulse-tube vibrations of cryogen-free refrigerators. Here, we solve the pulse-tube problem using a rigidly wired metallic sample holder, which provides a microkelvin environment with low heat leaks despite the vibrations. Further, we demonstrate an improved type of temperature sensor, the gate Coulomb blockade thermometer (gCBT), employing a gate metallization covering the entire device. This immunizes against nanofabrication imperfections and uncontrollable offset charges, and extends the range to lower temperatures compared to a junction CBT with the same island capacitance, here down to ≈160 μK for a 10% accuracy. Using on- and off-chip cooling, we demonstrate electronic temperatures as low as 224 ± 7 μK, remaining below 300 μK for 27 hours, thus providing time for experiments. Finally, we give an outlook for cooling below 50 μK for a future generation of microkelvin transport experiments.
U2 - 10.48550/arXiv.2110.06293
DO - 10.48550/arXiv.2110.06293
M3 - Journal article
VL - 4
JO - Physical Review Research
JF - Physical Review Research
SN - 2643-1564
IS - 3
M1 - 033225
ER -