Effective electron-phonon coupling and polaronic transition in the presence of strong correlation (Articolo in rivista)

Type
Label
  • Effective electron-phonon coupling and polaronic transition in the presence of strong correlation (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Barone, P; Raimondi, R; Capone, M; Castellani, C (2006)
    Effective electron-phonon coupling and polaronic transition in the presence of strong correlation
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Barone, P; Raimondi, R; Capone, M; Castellani, C (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 73 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Univ Roma Tre, Dipartimento Fis E Amaldi, I-00146 Rome, Italy; INFM, SMC, I-00185 Rome, Italy; CNR, Ist Sistemi Complessi, I-00185 Rome, Italy; Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy (literal)
Titolo
  • Effective electron-phonon coupling and polaronic transition in the presence of strong correlation (literal)
Abstract
  • We study the Hubbard-Holstein model using slave-boson mean-field and a variational Lang-Firsov transformation. We identify weak and strong e-ph coupling solutions, whose stability depends both on the bare e-ph coupling and on the correlation strength. At mean field level the evolution from weak to strong electron-phonon coupling occurs via a first-order polaronic transition if the adiabatic parameter is below a critical value. In the strongly correlated regime and in the adiabatic limit, the region in which the weak-coupling solution is stable is sizeably enlarged with respect to the weakly correlated system and the Mott metal-insulator transition is found to be robust with respect to e-ph interaction. (literal)
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