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Phys. Rev. Lett. 96, 016601 (2006) [4 pages]

Schwinger Boson Approach to the Fully Screened Kondo Model

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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

Received 6 July 2005; published 9 January 2006

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.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.016601
DOI:
10.1103/PhysRevLett.96.016601
PACS:
72.15.Qm, 71.27.+a, 73.43.Nq, 75.20.Hr
 
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