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Title: Extended Gutzwiller wavefunction for the Hubbard-Holstein model
Authors: Barone, Paolo
Raimondi, Roberto
Capone, Massimo
Castellani, Claudio
Fabrizio, Michele
Keywords: strongly correlated electron systems
lattice fermion models
electron-phonon interaction
Issue Date: 20-Jul-2007
Abstract: We introduce a new type of Gutzwiller variational wave function for correlated electrons coupled to phonons, able to treat on equal footing electronic and lattice degrees of freedom. We benchmark the wave function in the infinite-U Hubbard-Holstein model away from half-filling on a Bethe lattice, where we can directly compare with exact results by the Dynamical Mean-Field Theory. For this model, we find that variational results agree perfectly well with the exact ones. In particular the wave function correctly describes the crossover to a heavy polaron gas upon increasing the electron-phonon coupling.
DOI: 10.1209/0295-5075/79/47003
Appears in Collections:A - Articolo su rivista
X_Dipartimento di Fisica 'Edoardo Amaldi'

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