Please use this identifier to cite or link to this item: http://hdl.handle.net/2307/73
Title: Gutzwiller scheme for electrons and phonons: The half-filled Hubbard-Holstein model
Authors: Barone, Paolo
Raimondi, Roberto
Capone, Massimo
Castellani, Claudio
Fabrizio, Michele
Keywords: bipolarons
metal-insulator transition
electron-phonon interactions
strongly correlated electron systems
Issue Date: 19-Jun-2008
Abstract: We analyze the ground-state properties of strongly correlated electrons coupled with phonons by means of a generalized Gutzwiller wave function, which includes phononic degrees of freedom. We study in detail the paramagnetic half-filled Hubbard-Holstein model, where the electron-electron interaction can lead to a Mott transition and the electron-phonon coupling to a bipolaronic transition. We critically discuss the quality of the proposed wave function in describing the various transitions and crossovers that occur as a function of the parameters. Previous variational attempts are recovered as particular choices of the wave function, while keeping all the variational freedom allows to access regions of the phase diagram, otherwise inaccessible within previous variational approaches.
URI: http://hdl.handle.net/2307/73
DOI: 10.1103/PhysRevB.77.235115
Appears in Collections:A - Articolo su rivista
X_Dipartimento di Fisica 'Edoardo Amaldi'

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