Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-12-09
Physical Review B 71, 113107 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures
Scientific paper
10.1103/PhysRevB.71.113107
The role of the electron-phonon interaction in the Holstein-Hubbard model is investigated in the metallic phase close to the Mott transition and in the insulating Mott phase. The model is studied by means of a variational slave boson technique. At half-filling, mean-field static quantities are in good agreement with the results obtained by numerical techniques. By taking into account gaussian fluctuations, an analytic expression of the spectral density is derived in the Mott insulating phase showing that an increase of the electron-phonon coupling leads to a sensitive reduction of the Mott gap through a reduced effective repulsion. The relation of the results with recent experimental observations in strongly correlated systems is discussed.
Cataudella Vittorio
Filippis Giulio de
Perroni C. A.
Ramaglia Vincenzo Marigliano
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