Nonequilibrium Transport through a Kondo Dot: Decoherence Effects

Details Nonequilibrium Transport through a Kondo Dot: Decoherence Effects Nonequilibrium Transport through a Kondo Dot: Decoherence Effects

2004-01-12

arxiv.org/abs/cond-mat/0401180v1

Phys. Rev. B 70, 155301 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

16 pages, 4 figures

Scientific paper

10.1103/PhysRevB.70.155301

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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