Sub-Ohmic two-level system representation of the Kondo effect (Articolo in rivista)

Type
Label
  • Sub-Ohmic two-level system representation of the Kondo effect (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.85.073106 (literal)
Alternative label
  • Baruselli, Pier Paolo; Fabrizio, Michele (2012)
    Sub-Ohmic two-level system representation of the Kondo effect
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Baruselli, Pier Paolo; Fabrizio, Michele (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 85 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 4 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 7 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • International School for Advanced Studies; Consiglio Nazionale delle Ricerche (CNR); Abdus Salam International Centre for Theoretical Physics (literal)
Titolo
  • Sub-Ohmic two-level system representation of the Kondo effect (literal)
Abstract
  • It has been recently shown that the particle-hole symmetric Anderson impurity model can be mapped onto a Z(2) slave-spin theory without any need of additional constraints. Here, we prove by means of numerical renormalization group that the slave-spin behaves in this model like a two-level system coupled to a sub-Ohmic dissipative environment. It follows that the Z(2) symmetry gets spontaneously broken at zero temperature, which we find can be identified with the onset of Kondo coherence, being the Kondo temperature proportional to the square of the order parameter. Since the model is numerically solvable, the results are very enlightening on the role of quantum fluctuations beyond mean field in the context of slave-boson approaches to correlated electron models, an issue that has been attracting interest since the 80's. Finally, our results suggest as a byproduct that the paramagnetic metal phase of the Hubbard model at half-filling, in infinite coordination lattices and at zero temperature, as described for instance by dynamical mean-field theory, corresponds to a slave-spin theory with a spontaneous breakdown of a local Z(2) gauge symmetry. (literal)
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