Violation of the Wiedemann-Franz law in a single-electron transistor

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date

2008-02-14

Department

Department of Applied Physics

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Language

en

Pages

4
1-4

Series

PHYSICAL REVIEW LETTERS, Volume 100, issue 6

Abstract

We study the influence of Coulomb interaction on the thermoelectric transport coefficients for a metallic single-electron transistor. By performing a perturbation expansion up to second order in the tunnel-barrier conductance, we include sequential and cotunneling processes as well as quantum fluctuations that renormalize the charging energy and the tunnel conductance. We find that Coulomb interaction leads to a strong violation of the Wiedemann-Franz law: the Lorenz ratio becomes gate-voltage dependent for sequential tunneling, and is increased by a factor 9/5 in the cotunneling regime. Finally, we suggest a measurement scheme for an experimental realization.

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Keywords

Coulomb interaction, single-electron transistor, Wiedemann-Franz law

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DOI

10.1103/PhysRevLett.100.066801

Citation

Kubala, B, König, J & Pekola, J 2008, ' Violation of the Wiedemann-Franz law in a single-electron transistor ', Physical Review Letters, vol. 100, no. 6, 066801, pp. 1-4 . https://doi.org/10.1103/PhysRevLett.100.066801

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https://urn.fi/URN:NBN:fi:aalto-201805222637

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[article-cris] Perustieteiden korkeakoulu / SCI