Quantum phases of one-dimensional Hubbard models with three- and four-body couplings (Articolo in rivista)

Type
Label
  • Quantum phases of one-dimensional Hubbard models with three- and four-body couplings (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.88.115115 (literal)
Alternative label
  • Dolcini F. 1,2; Montorsi A. 1 (2013)
    Quantum phases of one-dimensional Hubbard models with three- and four-body couplings
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Dolcini F. 1,2; Montorsi A. 1 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://www.scopus.com/inward/record.url?eid=2-s2.0-84884833959&partnerID=q2rCbXpz (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 88 (literal)
Rivista
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  • 11 (literal)
Note
  • Scopu (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1 Dipartimento di Scienza Applicata e Tecnologia Del, Politecnico di Torino Corso, Duca degli Abruzzi 24, 10129 Torino, Italy; 2 CNR-SPIN, I-80126 Napoli, Italy (literal)
Titolo
  • Quantum phases of one-dimensional Hubbard models with three- and four-body couplings (literal)
Abstract
  • The experimental advances in cold atomic and molecular gases stimulate the investigation of lattice correlated systems beyond the conventional on-site Hubbard approximation, by possibly including multiparticle processes. We study fermionic extended Hubbard models in a one-dimensional lattice with different types of particle couplings, including also three- and four-body interactions up to nearest neighboring sites. By using the bosonization technique, we investigate the low-energy regime and determine the conditions for the appearance of ordered phases, for arbitrary particle filling. We find that three- and four-body couplings may significantly modify the phase diagram. In particular, diagonal three-body terms that directly couple the local particle densities have qualitatively different effects from off-diagonal three-body couplings originating from correlated hopping, and favor the appearance of a Luther-Emery phase even when two-body terms are repulsive. Furthermore, the four-body coupling gives rise to a rich phase diagram and may lead to the realization of the Haldane insulator phase at half-filling. © 2013 American Physical Society. (literal)
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