Quantum capacitance and charge sensing of a superconducting double dot
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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.
Lambert , N J , Esmail , A A , Edwards , M , Pollock , F A , Lovett , B W & Ferguson , A 2016 , ' Quantum capacitance and charge sensing of a superconducting double dot ' Applied Physics Letters , vol 109 , no. 11 , 112603 . DOI: 10.1063/1.4962811
Applied Physics Letters
© 2016, the Author(s). This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at scitation.aip.org / http://dx.doi.org/10.1063/1.4962811
We acknowledge the support from Hitachi Cambridge Laboratory and EPSRC Grant No. EP/K027018/1. A.J.F. is supported by a Hitachi Research fellowship.
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