Quantum capacitance and charge sensing of a superconducting double dot

Nicholas J. Lambert; Adam A. Esmail; Megan Edwards; Felix A. Pollock; Brendon William Lovett; Andrew Ferguson

doi:10.1063/1.4962811

Quantum capacitance and charge sensing of a superconducting double dot

Nicholas J. Lambert, Adam A. Esmail, Megan Edwards, Felix A. Pollock, Brendon William Lovett, Andrew Ferguson

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

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
Early online date	15 Sept 2016
DOIs	https://doi.org/10.1063/1.4962811
Publication status	Published - Sept 2016

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Brendon_2016_Quantum_APL_AAM
© 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
Accepted author manuscript, 987 KB

Entangling dopant nuclear spins: Entangling dopant nuclear spins using double quantum dots
Lovett, B. W. (PI)
EPSRC
1/09/13 → 31/08/17
Project: Standard

Cite this

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title = "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. ",

author = "Lambert, {Nicholas J.} and Esmail, {Adam A.} and Megan Edwards and Pollock, {Felix A.} and Lovett, {Brendon William} and Andrew Ferguson",

note = "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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AU - Lambert, Nicholas J.

AU - Esmail, Adam A.

AU - Edwards, Megan

AU - Pollock, Felix A.

AU - Lovett, Brendon William

AU - Ferguson, Andrew

N1 - 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.

PY - 2016/9

Y1 - 2016/9

N2 - 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.

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.

U2 - 10.1063/1.4962811

DO - 10.1063/1.4962811

M3 - Letter

SN - 0003-6951

VL - 109

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 11

M1 - 112603

ER -

Quantum capacitance and charge sensing of a superconducting double dot

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Entangling dopant nuclear spins: Entangling dopant nuclear spins using double quantum dots

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