Observation of quantum capacitance in the Cooper-pair transistor

Duty, T., Johansson, G., Bladh, K., Gunnarsson, D., Wilson , C. and Delsing, P. (2005) Observation of quantum capacitance in the Cooper-pair transistor. Physical Review Letters, 95 20: 206807-1-206807-4. doi:10.1103/PhysRevLett.95.206807

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Author Duty, T.
Johansson, G.
Bladh, K.
Gunnarsson, D.
Wilson , C.
Delsing, P.
Title Observation of quantum capacitance in the Cooper-pair transistor
Journal name Physical Review Letters   Check publisher's open access policy
ISSN 0031-9007
1079-7114
Publication date 2005
Sub-type Article (original research)
DOI 10.1103/PhysRevLett.95.206807
Open Access Status File (Publisher version)
Volume 95
Issue 20
Start page 206807-1
End page 206807-4
Total pages 4
Place of publication Ridge, New York
Publisher The American Physical Society
Language eng
Subject 240000 Physical Sciences
Abstract We have fabricated a Cooper-pair transistor (CPT) with parameters such that for appropriate voltage biases, it behaves essentially like a single Cooper-pair box (SCB). The effective capacitance of a SCB can be defined as the derivative of the induced charge with respect to gate voltage and has two parts, the geometric capacitance, C-geom, and the quantum capacitance C-Q. The latter is due to the level anticrossing caused by the Josephson coupling and is dual to the Josephson inductance. It depends parametrically on the gate voltage and its magnitude may be substantially larger than C-geom. We have detected C-Q in our CPT, by measuring the in phase and quadrature rf signal reflected from a resonant circuit in which the CPT is embedded. C-Q can be used as the basis of a charge qubit readout by placing a Cooper-pair box in such a resonant circuit.
Keyword Physics, Multidisciplinary
Single-electron Transistor
Quantum Capacitance Cq
Small Josephson-junctions
Circuit
Devices
State
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Physical Sciences Publications
 
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Created: Mon, 04 Aug 2008, 09:30:56 EST by Thelma Whitbourne on behalf of School of Mathematics & Physics