title: Electron-phonon interaction close to a Mott transition.
abstract: The effect of Holstein electron-phonon interaction on a Hubbard model close to a Mott-Hubbard transition at half filling is investigated by means of dynamical mean-field theory. We observe a reduction of the effective mass that we interpret in terms of a reduced effective repulsion. When the repulsion is rescaled to take into account this effect, the quasiparticle low-energy features are unaffected by the electron-phonon interaction. Phonon features are only observed within the high-energy Hubbard bands. The lack of electron-phonon fingerprints in the quasiparticle physics can be explained interpreting the quasiparticle motion in terms of rare fast processes.
authors.affiliation: INFM Statistical Mechanics and Complexity Center, and Dipartimento di Fisica, Università di Roma La Sapienza Piazzale Aldo Moro 5, I-00185 Roma, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Sangiovanni
authors.forename: M
authors.initials: M
authors.lastname: Capone
authors.forename: C
authors.initials: C
authors.lastname: Castellani
authors.forename: M
authors.initials: M
authors.lastname: Grilli