Quantum capacitance and charge sensing of a superconducting double dot

N. J. Lambert, A. A. Esmail, M. Edwards, Felix Pollock, B. W. Lovett, A. J. Ferguson

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We study the energetics of a superconducting double dot, by measuring both the quantum capacitance of the device and the response of a nearby charge sensor. We observe different behaviour for odd and even charge states and describe this with a model based on the competition between the charging energy and the superconducting gap. We also find that, at finite temperatures, thermodynamic considerations have a significant effect on the charge stability diagram.

Original languageEnglish
Article number112603
Number of pages4
JournalApplied Physics Letters
Issue number11
Publication statusPublished - 12 Sep 2016

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