Optimized proximity thermometer for ultrasensitive detection

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2019
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Karimi, Bayan
Tuukkanen, Tuomas
Peltonen, Joonas T.
Belzig, Wolfgang
Pekola, Jukka P.
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Physical Review Applied. American Physical Society (APS). 2019, 13(5), 054001. eISSN 2331-7019. Available under: doi: 10.1103/PhysRevApplied.13.054001
Zusammenfassung

We present a set of experiments to optimize the performance of a noninvasive thermometer based on proximity superconductivity. Current through a standard tunnel junction between an aluminum superconductor and a copper electrode is controlled by the strength of the proximity induced to this normal metal, which in turn is determined by the position of a direct superconducting contact from the tunnel junction. Several devices with different distances are tested. We develop a theoretical model based on Usadel equations and dynamic Coulomb blockade that reproduces the measured results and yields a tool to calibrate the thermometer and to optimize it further in future experiments. We also propose an analytic formula that reproduces the experimental data for a wide range of temperatures.

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ISO 690KARIMI, Bayan, Danilo NIKOLIĆ, Tuomas TUUKKANEN, Joonas T. PELTONEN, Wolfgang BELZIG, Jukka P. PEKOLA, 2019. Optimized proximity thermometer for ultrasensitive detection. In: Physical Review Applied. American Physical Society (APS). 2019, 13(5), 054001. eISSN 2331-7019. Available under: doi: 10.1103/PhysRevApplied.13.054001
BibTex
@article{Karimi2019-11-07T10:56:39ZOptim-47498.2,
  year={2019},
  doi={10.1103/PhysRevApplied.13.054001},
  title={Optimized proximity thermometer for ultrasensitive detection},
  number={5},
  volume={13},
  journal={Physical Review Applied},
  author={Karimi, Bayan and Nikolić, Danilo and Tuukkanen, Tuomas and Peltonen, Joonas T. and Belzig, Wolfgang and Pekola, Jukka P.},
  note={Article Number: 054001}
}
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