Charge noise in single-electron transistors and charge qubits may be caused by metallic grains

Kafanov, S., Brenning, H., Duty, T. and Delsing, P. (2008) Charge noise in single-electron transistors and charge qubits may be caused by metallic grains. Physical Review B, 78 12: Article Number: 125411. doi:10.1103/PhysRevB.78.125411

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Author Kafanov, S.
Brenning, H.
Duty, T.
Delsing, P.
Title Charge noise in single-electron transistors and charge qubits may be caused by metallic grains
Journal name Physical Review B   Check publisher's open access policy
ISSN 1098-0121
Publication date 2008-09-01
Sub-type Article (original research)
DOI 10.1103/PhysRevB.78.125411
Open Access Status File (Publisher version)
Volume 78
Issue 12
Start page Article Number: 125411
Total pages 7
Editor P.D. Adams
Place of publication College Park, Maryland, USA
Publisher American Physical Society
Language eng
Subject C1
970102 Expanding Knowledge in the Physical Sciences
029999 Physical Sciences not elsewhere classified
Abstract We report on measurements of low-frequency noise in a single-electron transistor (SET) from a few hertz up to 10 MHz. Measurements were done for different bias and gate voltages, which allow us to separate noise contributions from different noise sources. We find a 1/f noise spectrum with two Lorentzians superimposed. The cut-off frequency of one of the Lorentzians varies systematically with the potential of the SET island. Our data is consistent with two single-charge fluctuators situated close to the tunnel barrier. We suggest that these are due to random charging of aluminum grains, each acting as a single-electron box with tunnel coupling to one of the leads and capacitively coupled to the SET island. We are able to fit the data to our model and extract parameters for the fluctuators.
Keyword TUNNELING DEVICES
LIMIT
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Mathematics and Physics
 
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Created: Fri, 17 Apr 2009, 19:44:45 EST by Jo Hughes on behalf of School of Mathematics & Physics