On the perturbative expansion of the magnetization in the out-of-equilibrium Kondo model

Details On the perturbative expansion of the magnetization in the out-of-equilibrium Kondo model On the perturbative expansion of the magnetization in the out-of-equilibrium Kondo model

2002-02-25

arxiv.org/abs/cond-mat/0202425v3

Phys. Rev. B 66, 085315 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

Minor corrections forgotten in v2

Scientific paper

10.1103/PhysRevB.66.085315

This paper is concerned with the out-of-equilibrium two-lead Kondo model, considered as a model of a quantum dot in the Kondo regime. We revisit the perturbative expansion of the dot's magnetization, and conclude that, even at order 0 in the Kondo interactions, the magnetization is not given by the usual equilibrium result. We use the Schwinger-Keldysh method to derive a Dyson equation describing the steady state induced by the voltage between the two leads, and thus present the correct procedure for calculating perturbative expansions of steady-state properties of the system.

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