Quantum spins on star graphs and the Kondo model (Articolo in rivista)

Type
Label
  • Quantum spins on star graphs and the Kondo model (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.nuclphysb.2013.03.001 (literal)
Alternative label
  • Crampe, N.; Trombettoni, A. (2013)
    Quantum spins on star graphs and the Kondo model
    in Nuclear physics. B (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Crampe, N.; Trombettoni, A. (literal)
Pagina inizio
  • 526 (literal)
Pagina fine
  • 538 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 871 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 13 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 3 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Centre National de la Recherche Scientifique (CNRS); University of Montpellier II; CNR IOM DEMOCRITOS Simulat Ctr; International School for Advanced Studies; Istituto Nazionale di Fisica Nucleare (literal)
Titolo
  • Quantum spins on star graphs and the Kondo model (literal)
Abstract
  • We study the XX model for quantum spins on the star graph with three legs (i.e., on a Y-junction). By performing a Jordan-Wigner transformation supplemented by the introduction of an auxiliary space we find a Kondo Hamiltonian of fermions, in the spin 1 representation of su(2), locally coupled with a magnetic impurity. In the continuum limit our model is shown to be equivalent to the 4-channel Kondo model coupling spin-l/2 fermions with a spin-l/2 impurity and exhibiting a non-Fermi liquid behavior. We also show that it is possible to find an XY model such that after the Jordan Wigner transformation one obtains a quadratic fermionic Hamiltonian directly diagonalizable. (C) 2013 Elsevier B.V. All rights reserved. (literal)
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