Quantum capacitance and charge sensing of a superconducting double dot
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.
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
ISSN
0003-6951Type
Journal item
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
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