Optimized proximity thermometer for ultrasensitive detection : Role of an ohmic electromagnetic environment

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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2023-07-01
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Language
en
Pages
7
1-7
Series
Physical Review B, Volume 108, issue 2
Abstract
We propose a mesoscopic thermometer for ultrasensitive detection based on the proximity effect in superconductor-normal metal (SN) heterostructures. The device is based on the zero-bias anomaly due to the inelastic Cooper-pair tunneling in an SNIS junction (I stands for an insulator) coupled to an ohmic electromagnetic (EM) environment. The theoretical model is done in the framework of the quasiclassical Usadel Green's formalism and the dynamical Coulomb blockade. The usage of an ohmic EM environment makes the thermometer highly sensitive down to very low temperatures, Formula Presented. Moreover, defined in this way, the thermometer is stable against small but nonvanishing voltage amplitudes typically used for measuring the zero-bias differential conductance in experiments. Finally, we propose a simplified view, based on an analytic treatment, which is in very good agreement with numerical results and can serve as a tool for the development, calibration, and optimization of such devices in future experimentsin quantum calorimetry.
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Funding Information: This work received funding from the European Union's Horizon 2020 research and innovation program under Marie Sklodowska-Curie actions (Grant No. 766025, QuESTech) and Deutsche Forschungsgemeinschaft (DFG; German Research Foundation) via SFB 1432 (Project No. 425217212). | openaire: EC/H2020/766025/EU//QuESTech
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Citation
Nikolić , D , Karimi , B , Rengel , D S , Pekola , J P & Belzig , W 2023 , ' Optimized proximity thermometer for ultrasensitive detection : Role of an ohmic electromagnetic environment ' , Physical Review B , vol. 108 , no. 2 , 024507 , pp. 1-7 . https://doi.org/10.1103/PhysRevB.108.024507