Schwinger Boson Approach to the Fully Screened Kondo Model

J. Rech, P. Coleman, G. Zarand, and O. Parcollet
Phys. Rev. Lett. 96, 016601 – Published 9 January 2006

Abstract

We apply the Schwinger boson scheme to the fully screened Kondo model and generalize the method to include antiferromagnetic interactions between ions. Our approach captures the Kondo crossover from local moment behavior to a Fermi liquid with a nontrivial Wilson ratio. When applied to the two-impurity model, the mean-field theory describes the “Varma-Jones” quantum phase transition between a valence bond state and a heavy Fermi liquid.

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  • Received 6 July 2005

DOI:https://doi.org/10.1103/PhysRevLett.96.016601

©2006 American Physical Society

Authors & Affiliations

J. Rech1,2,3, P. Coleman1,2, G. Zarand1,4, and O. Parcollet3

  • 1Kavli Institute for Theoretical Physics, Kohn Hall, University of California at Santa Barbara, Santa Barbara, California 93106, USA
  • 2Center for Materials Theory, Rutgers University, Piscataway, New Jersey 08855, USA
  • 3Service de Physique Théorique, CEA/DSM/SPhT-CNRS/SPM/URA 2306, CEA/Saclay, F-91191 Gif-sur-Yvette Cedex, France
  • 4Theoretical Physics Department, Budapest University of Technology and Economics, Budafoki ut 8. H-1521 Hungary

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Issue

Vol. 96, Iss. 1 — 13 January 2006

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