Nematic phase transition in a multi-orbital Hubbard model (Articolo in rivista)

Type
Label
  • Nematic phase transition in a multi-orbital Hubbard model (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/1751-8113/47/46/465002 (literal)
Alternative label
  • Guarnaccia, Giuseppe; Noce, Canio (2014)
    Nematic phase transition in a multi-orbital Hubbard model
    in Journal of physics. A, Mathematical and theoretical (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Guarnaccia, Giuseppe; Noce, Canio (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 47 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 12 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 46 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • University of Salerno; Consiglio Nazionale delle Ricerche (CNR) (literal)
Titolo
  • Nematic phase transition in a multi-orbital Hubbard model (literal)
Abstract
  • By using the reflection positivity method, we rigorously establish some exact properties of a multi-orbital Hubbard model, here adopted to describe a nematic orbital phase transition. We show that, when the on-site intra-orbital Coulomb interaction is equal to the on-site inter-orbital Coulomb interaction, this model supports a staggered nematic orbital order if repulsive or attractive on-site inter-orbital and intra-orbital interactions and off-site repulsive interorbital interaction are considered. Depending on the dimensions of the bipartite lattice where the model is defined, we find that, at half-filling, the order may or may not exist. In particular, we prove that the order may exist, in two and three dimensions, at sufficiently low temperatures if the hopping amplitude is small enough. (literal)
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