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

  title={Violation of the Wiedemann-Franz law in a single-electron transistor.},
  author={Bj{\"o}rn Kubala and J{\"u}rgen K{\"o}nig and Jukka Pekola},
  journal={Physical review letters},
  volume={100 6},
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… CONTINUE READING

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