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

doi:10.1063/1.4962811

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

School of Physics and Astronomy

Research output: Contribution to journal › Article › Research › peer-review

8 Citations (Scopus)

Abstract

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 language	English
Article number	112603
Number of pages	4
Journal	Applied Physics Letters
Volume	109
Issue number	11
DOIs	https://doi.org/10.1063/1.4962811
Publication status	Published - 12 Sept 2016

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AU - Esmail, A. A.

AU - Edwards, M.

AU - Pollock, Felix

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AU - Ferguson, A. J.

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AB - 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.

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Quantum capacitance and charge sensing of a superconducting double dot

Abstract

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