Failure of the mean-field approach in the out-of-equilibrium Anderson model

B. Horváth, B. Lazarovits, O. Sauret, G. Zaránd

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Abstract

To explore the limitations of the mean-field approximation, frequently used in ab initio molecular electronics calculations, we study an out-of-equilibrium Anderson impurity model in a scattering formalism. We find regions in the parameter space where both magnetic and nonmagnetic solutions are stable. We also observe a hysteresis in the nonequilibrium magnetization and current as a function of the applied bias voltage. The mean-field method also predicts incorrectly local moment formation for large biases and a spin polarized current, and unphysical kinks appear in various physical quantities. The mean-field approximation thus fails in every region where it predicts local moment formation.

Original languageEnglish
Article number113108
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume77
Issue number11
DOIs
Publication statusPublished - Mar 31 2008

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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