Perturbative expansion of the magnetization in the out-of-equilibrium Kondo model

O. Parcollet and C. Hooley
Phys. Rev. B 66, 085315 – Published 19 August 2002
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Abstract

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.

  • Received 1 March 2002

DOI:https://doi.org/10.1103/PhysRevB.66.085315

©2002 American Physical Society

Authors & Affiliations

O. Parcollet1,2 and C. Hooley1,3

  • 1Center for Materials Theory, Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854
  • 2Service de Physique Théorique, CEA Saclay, 91191 Gif-Sur-Yvette, France
  • 3School of Physics and Astronomy, Birmingham University, Edgbaston, Birmingham B15 2TT, United Kingdom

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Issue

Vol. 66, Iss. 8 — 15 August 2002

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