Quantum capacitance and charge sensing of a superconducting double dot

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.

Citation

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 . https://doi.org/10.1063/1.4962811

Publication

Applied Physics Letters

Status

Peer reviewed

DOI

https://doi.org/10.1063/1.4962811

ISSN

0003-6951

Type

Journal item

Rights

© 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

Description

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.

Collections

University of St Andrews Research

URI

http://hdl.handle.net/10023/9582