We describe a theoretical scheme for the determination of quasiparticle spectra starting from the energy band structure of a metal and treating the on-site Hubbard repulsion beyond the mean-field theory. The method relies upon an expansion of the many-body states in terms of uncorrelated states with a different number of electron-hole pairs. By truncating the expansion to include configurations with one or two pairs one can achieve approximate expressions of the electron and hole self-energies. The interparticle scattering matrices appearing in such expressions are conveniently calculated using the Faddeev approach. Calculations performed for a constant density of states allow us to illustrate the role of three-body correlations in the metal-insulator transitions.

Three-Body Scattering Theory of Correlated Hole and Electron States / CALANDRA BUONAURA, Carlo; MANGHI, Franca. - In: PHYSICAL REVIEW. B, CONDENSED MATTER. - ISSN 0163-1829. - STAMPA. - 50:(1994), pp. 2061-2074.

Three-Body Scattering Theory of Correlated Hole and Electron States

CALANDRA BUONAURA, Carlo;MANGHI, Franca
1994

Abstract

We describe a theoretical scheme for the determination of quasiparticle spectra starting from the energy band structure of a metal and treating the on-site Hubbard repulsion beyond the mean-field theory. The method relies upon an expansion of the many-body states in terms of uncorrelated states with a different number of electron-hole pairs. By truncating the expansion to include configurations with one or two pairs one can achieve approximate expressions of the electron and hole self-energies. The interparticle scattering matrices appearing in such expressions are conveniently calculated using the Faddeev approach. Calculations performed for a constant density of states allow us to illustrate the role of three-body correlations in the metal-insulator transitions.
50
2061
2074
Three-Body Scattering Theory of Correlated Hole and Electron States / CALANDRA BUONAURA, Carlo; MANGHI, Franca. - In: PHYSICAL REVIEW. B, CONDENSED MATTER. - ISSN 0163-1829. - STAMPA. - 50:(1994), pp. 2061-2074.
CALANDRA BUONAURA, Carlo; Manghi, Franca
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/455322
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