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.

Barone, P., Raimondi, R., Capone, M., Castelllani, C., Fabrizio, M.p. (2007). Extended Gutzwiller wavefunction for the Hubbard-Holstein model. EUROPHYSICS LETTERS, 79, 47003-p1-47003-p5 [10.1209/0295-5075/79/47003].

Extended Gutzwiller wavefunction for the Hubbard-Holstein model

RAIMONDI, Roberto;
2007-01-01

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.
2007
Barone, P., Raimondi, R., Capone, M., Castelllani, C., Fabrizio, M.p. (2007). Extended Gutzwiller wavefunction for the Hubbard-Holstein model. EUROPHYSICS LETTERS, 79, 47003-p1-47003-p5 [10.1209/0295-5075/79/47003].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/146284
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