Nonequilibrium transport through a Kondo dot: Decoherence effects

J. Paaske, A. Rosch, J. Kroha, and P. Wölfle
Phys. Rev. B 70, 155301 – Published 4 October 2004

Abstract

We investigate the effects of voltage induced spin-relaxation in a quantum dot in the Kondo regime. Using nonequilibrium perturbation theory, we determine the joint effect of self-energy and vertex corrections to the conduction electron T-matrix in the limit of transport voltage much larger than temperature. The logarithmic divergences, developing near the different chemical potentials of the leads, are found to be cut off by spin-relaxation rates, implying that the nonequilibrium Kondo-problem remains at weak coupling as long as voltage is much larger than the Kondo temperature.

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  • Received 12 January 2004

DOI:https://doi.org/10.1103/PhysRevB.70.155301

©2004 American Physical Society

Authors & Affiliations

J. Paaske1, A. Rosch1,2, J. Kroha3, and P. Wölfle1

  • 1Institut für Theorie der Kondensierten Materie, Universität Karlsruhe, 76128 Karlsruhe, Germany
  • 2Institut für Theoretische Physik, Universität zu Köln, 50937 Köln, Germany
  • 3Physikalishes Institut, Universität Bonn, 53115 Bonn, Germany

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Issue

Vol. 70, Iss. 15 — 15 October 2004

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